feat: turns on self-signed JWT feature flag (#34)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 392067151

Source-Link: googleapis/googleapis@06345f7

Source-Link: https://github.com/googleapis/googleapis-gen/commit/95882b37970e41e4cd51b22fa507cfd46dc7c4b6

Author: gcf-owl-bot[bot]

src/v1beta1/private_catalog_client.ts

@@ -151,6 +151,12 @@ export class PrivateCatalogClient {
     // Save the auth object to the client, for use by other methods.
     this.auth = this._gaxGrpc.auth as gax.GoogleAuth;
 
+    // Set useJWTAccessWithScope on the auth object.
+    this.auth.useJWTAccessWithScope = true;
+
+    // Set defaultServicePath on the auth object.
+    this.auth.defaultServicePath = staticMembers.servicePath;
+
     // Set the default scopes in auth client if needed.
     if (servicePath === staticMembers.servicePath) {
       this.auth.defaultScopes = staticMembers.scopes;