fix: fixes for dynamic routing and streaming descriptors (#1639)

* fix: fixes for dynamic routing and streaming descriptors

Use gapic-generator-typescript v2.14.5.

PiperOrigin-RevId: 450616838

Source-Link: googleapis/googleapis@7a47b72

Source-Link: googleapis/googleapis-gen@42cc633
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src/v1/spanner_client.ts

@@ -192,10 +192,12 @@ export class SpannerClient {
     // Provide descriptors for these.
     this.descriptors.stream = {
       executeStreamingSql: new this._gaxModule.StreamDescriptor(
-        gax.StreamType.SERVER_STREAMING
+        gax.StreamType.SERVER_STREAMING,
+        opts.fallback === 'rest'
       ),
       streamingRead: new this._gaxModule.StreamDescriptor(
-        gax.StreamType.SERVER_STREAMING
+        gax.StreamType.SERVER_STREAMING,
+        opts.fallback === 'rest'
       ),
     };