fix(networkservices): update the API

#### networkservices:v1beta1

The following keys were changed:
- schemas.LbRouteExtension.properties.metadata.description
- schemas.LbTrafficExtension.properties.metadata.description

#### networkservices:v1

The following keys were changed:
- schemas.LbRouteExtension.properties.metadata.description
- schemas.LbTrafficExtension.properties.metadata.description

discovery/networkservices-v1.json

@@ -2756,7 +2756,7 @@
       }
     }
   },
-  "revision": "20240515",
+  "revision": "20240620",
   "rootUrl": "https://networkservices.googleapis.com/",
   "schemas": {
     "AuditConfig": {
@@ -4113,7 +4113,7 @@
             "description": "Properties of the object.",
             "type": "any"
           },
-          "description": "Optional. The metadata provided here will be included as part of the `metadata_context` (of type `google.protobuf.Struct`) in the `ProcessingRequest` message sent to the extension server. The metadata will be available under the namespace `com.google.lb_route_extension.`. The following variables are supported in the metadata Struct: `{forwarding_rule_id}` - substituted with the forwarding rule's fully qualified resource name.",
+          "description": "Optional. The metadata provided here is included as part of the `metadata_context` (of type `google.protobuf.Struct`) in the `ProcessingRequest` message sent to the extension server. The metadata is available under the namespace `com.google.lb_route_extension.`. The following variables are supported in the metadata Struct: `{forwarding_rule_id}` - substituted with the forwarding rule's fully qualified resource name.",
           "type": "object"
         },
         "name": {
@@ -4183,7 +4183,7 @@
             "description": "Properties of the object.",
             "type": "any"
           },
-          "description": "Optional. The metadata provided here will be included in the `ProcessingRequest.metadata_context.filter_metadata` map field. The metadata will be available under the key `com.google.lb_traffic_extension.`. The following variables are supported in the metadata: `{forwarding_rule_id}` - substituted with the forwarding rule's fully qualified resource name.",
+          "description": "Optional. The metadata provided here is included in the `ProcessingRequest.metadata_context.filter_metadata` map field. The metadata is available under the key `com.google.lb_traffic_extension.`. The following variables are supported in the metadata: `{forwarding_rule_id}` - substituted with the forwarding rule's fully qualified resource name.",
           "type": "object"
         },
         "name": {

discovery/networkservices-v1beta1.json

@@ -2483,7 +2483,7 @@
       }
     }
   },
-  "revision": "20240515",
+  "revision": "20240613",
   "rootUrl": "https://networkservices.googleapis.com/",
   "schemas": {
     "AuditConfig": {
@@ -3797,7 +3797,7 @@
             "description": "Properties of the object.",
             "type": "any"
           },
-          "description": "Optional. The metadata provided here will be included as part of the `metadata_context` (of type `google.protobuf.Struct`) in the `ProcessingRequest` message sent to the extension server. The metadata will be available under the namespace `com.google.lb_route_extension.`. The following variables are supported in the metadata Struct: `{forwarding_rule_id}` - substituted with the forwarding rule's fully qualified resource name.",
+          "description": "Optional. The metadata provided here is included as part of the `metadata_context` (of type `google.protobuf.Struct`) in the `ProcessingRequest` message sent to the extension server. The metadata is available under the namespace `com.google.lb_route_extension.`. The following variables are supported in the metadata Struct: `{forwarding_rule_id}` - substituted with the forwarding rule's fully qualified resource name.",
           "type": "object"
         },
         "name": {
@@ -3867,7 +3867,7 @@
             "description": "Properties of the object.",
             "type": "any"
           },
-          "description": "Optional. The metadata provided here will be included in the `ProcessingRequest.metadata_context.filter_metadata` map field. The metadata will be available under the key `com.google.lb_traffic_extension.`. The following variables are supported in the metadata: `{forwarding_rule_id}` - substituted with the forwarding rule's fully qualified resource name.",
+          "description": "Optional. The metadata provided here is included in the `ProcessingRequest.metadata_context.filter_metadata` map field. The metadata is available under the key `com.google.lb_traffic_extension.`. The following variables are supported in the metadata: `{forwarding_rule_id}` - substituted with the forwarding rule's fully qualified resource name.",
           "type": "object"
         },
         "name": {

src/apis/networkservices/v1.ts

@@ -1084,7 +1084,7 @@ export namespace networkservices_v1 {
      */
     loadBalancingScheme?: string | null;
     /**
-     * Optional. The metadata provided here will be included as part of the `metadata_context` (of type `google.protobuf.Struct`) in the `ProcessingRequest` message sent to the extension server. The metadata will be available under the namespace `com.google.lb_route_extension.`. The following variables are supported in the metadata Struct: `{forwarding_rule_id\}` - substituted with the forwarding rule's fully qualified resource name.
+     * Optional. The metadata provided here is included as part of the `metadata_context` (of type `google.protobuf.Struct`) in the `ProcessingRequest` message sent to the extension server. The metadata is available under the namespace `com.google.lb_route_extension.`. The following variables are supported in the metadata Struct: `{forwarding_rule_id\}` - substituted with the forwarding rule's fully qualified resource name.
      */
     metadata?: {[key: string]: any} | null;
     /**
@@ -1125,7 +1125,7 @@ export namespace networkservices_v1 {
      */
     loadBalancingScheme?: string | null;
     /**
-     * Optional. The metadata provided here will be included in the `ProcessingRequest.metadata_context.filter_metadata` map field. The metadata will be available under the key `com.google.lb_traffic_extension.`. The following variables are supported in the metadata: `{forwarding_rule_id\}` - substituted with the forwarding rule's fully qualified resource name.
+     * Optional. The metadata provided here is included in the `ProcessingRequest.metadata_context.filter_metadata` map field. The metadata is available under the key `com.google.lb_traffic_extension.`. The following variables are supported in the metadata: `{forwarding_rule_id\}` - substituted with the forwarding rule's fully qualified resource name.
      */
     metadata?: {[key: string]: any} | null;
     /**

src/apis/networkservices/v1beta1.ts

@@ -1058,7 +1058,7 @@ export namespace networkservices_v1beta1 {
      */
     loadBalancingScheme?: string | null;
     /**
-     * Optional. The metadata provided here will be included as part of the `metadata_context` (of type `google.protobuf.Struct`) in the `ProcessingRequest` message sent to the extension server. The metadata will be available under the namespace `com.google.lb_route_extension.`. The following variables are supported in the metadata Struct: `{forwarding_rule_id\}` - substituted with the forwarding rule's fully qualified resource name.
+     * Optional. The metadata provided here is included as part of the `metadata_context` (of type `google.protobuf.Struct`) in the `ProcessingRequest` message sent to the extension server. The metadata is available under the namespace `com.google.lb_route_extension.`. The following variables are supported in the metadata Struct: `{forwarding_rule_id\}` - substituted with the forwarding rule's fully qualified resource name.
      */
     metadata?: {[key: string]: any} | null;
     /**
@@ -1099,7 +1099,7 @@ export namespace networkservices_v1beta1 {
      */
     loadBalancingScheme?: string | null;
     /**
-     * Optional. The metadata provided here will be included in the `ProcessingRequest.metadata_context.filter_metadata` map field. The metadata will be available under the key `com.google.lb_traffic_extension.`. The following variables are supported in the metadata: `{forwarding_rule_id\}` - substituted with the forwarding rule's fully qualified resource name.
+     * Optional. The metadata provided here is included in the `ProcessingRequest.metadata_context.filter_metadata` map field. The metadata is available under the key `com.google.lb_traffic_extension.`. The following variables are supported in the metadata: `{forwarding_rule_id\}` - substituted with the forwarding rule's fully qualified resource name.
      */
     metadata?: {[key: string]: any} | null;
     /**