chore(deps): upgrade gapic-generator-java to 2.8.0 and update gax-jav…

…a to 2.18.1 (#800)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 450543911

Source-Link: googleapis/googleapis@5528344

Source-Link: googleapis/googleapis-gen@9f6775c
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiOWY2Nzc1Y2FiMTk1ODk4MmI4ODk2N2E0M2U1ZTgwNmFmMGYxMzVkYiJ9

google-cloud-trace/src/main/java/com/google/cloud/trace/v1/TraceServiceClient.java

@@ -18,7 +18,6 @@
 
 import com.google.api.core.ApiFuture;
 import com.google.api.core.ApiFutures;
-import com.google.api.core.BetaApi;
 import com.google.api.gax.core.BackgroundResource;
 import com.google.api.gax.paging.AbstractFixedSizeCollection;
 import com.google.api.gax.paging.AbstractPage;
@@ -132,7 +131,6 @@ public static final TraceServiceClient create(TraceServiceSettings settings) thr
    * Constructs an instance of TraceServiceClient, using the given stub for making calls. This is
    * for advanced usage - prefer using create(TraceServiceSettings).
    */
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public static final TraceServiceClient create(TraceServiceStub stub) {
     return new TraceServiceClient(stub);
   }
@@ -147,7 +145,6 @@ protected TraceServiceClient(TraceServiceSettings settings) throws IOException {
     this.stub = ((TraceServiceStubSettings) settings.getStubSettings()).createStub();
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   protected TraceServiceClient(TraceServiceStub stub) {
     this.settings = null;
     this.stub = stub;
@@ -157,7 +154,6 @@ public final TraceServiceSettings getSettings() {
     return settings;
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public TraceServiceStub getStub() {
     return stub;
   }

google-cloud-trace/src/main/java/com/google/cloud/trace/v1/stub/TraceServiceStubSettings.java

@@ -173,7 +173,6 @@ public UnaryCallSettings<PatchTracesRequest, Empty> patchTracesSettings() {
     return patchTracesSettings;
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public TraceServiceStub createStub() throws IOException {
     if (getTransportChannelProvider()
         .getTransportName()

google-cloud-trace/src/main/java/com/google/cloud/trace/v2/TraceServiceClient.java

@@ -16,7 +16,6 @@
 
 package com.google.cloud.trace.v2;
 
-import com.google.api.core.BetaApi;
 import com.google.api.gax.core.BackgroundResource;
 import com.google.api.gax.rpc.UnaryCallable;
 import com.google.cloud.trace.v2.stub.TraceServiceStub;
@@ -122,7 +121,6 @@ public static final TraceServiceClient create(TraceServiceSettings settings) thr
    * Constructs an instance of TraceServiceClient, using the given stub for making calls. This is
    * for advanced usage - prefer using create(TraceServiceSettings).
    */
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public static final TraceServiceClient create(TraceServiceStub stub) {
     return new TraceServiceClient(stub);
   }
@@ -137,7 +135,6 @@ protected TraceServiceClient(TraceServiceSettings settings) throws IOException {
     this.stub = ((TraceServiceStubSettings) settings.getStubSettings()).createStub();
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   protected TraceServiceClient(TraceServiceStub stub) {
     this.settings = null;
     this.stub = stub;
@@ -147,7 +144,6 @@ public final TraceServiceSettings getSettings() {
     return settings;
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public TraceServiceStub getStub() {
     return stub;
   }

google-cloud-trace/src/main/java/com/google/cloud/trace/v2/stub/TraceServiceStubSettings.java

@@ -99,7 +99,6 @@ public UnaryCallSettings<Span, Span> createSpanSettings() {
     return createSpanSettings;
   }
 
-  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
   public TraceServiceStub createStub() throws IOException {
     if (getTransportChannelProvider()
         .getTransportName()