feat: add comment to service client to disclose api version.

[zhumin8]

Follow-up to #2630 #2671.

This pr adds to service client composer to expose api-version via class comment.

Note: reverted api-version option in gapic-generator-java/src/test/proto/echo_grpcrest.proto, which was added by accident in #2671. All test related to api-version should use api_version_testing.proto instead.

[sonarqubecloud]

Quality Gate passed for 'gapic-generator-java-root'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[sonarqubecloud]

Quality Gate passed for 'java_showcase_integration_tests'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[snippet-bot]

Here is the summary of possible violations 😱

There are 12 possible violations for not having product prefix.

• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/AsyncEchoWithVersionMethod.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_async
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncCreateSetCredentialsProvider.golden:19, tag goldensample_generated_EchoWithVersion_Create_SetCredentialsProvider_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncCreateSetEndpoint.golden:19, tag goldensample_generated_EchoWithVersion_Create_SetEndpoint_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethod.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodFoobarname.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_Foobarname_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodNoargs.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_Noargs_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodResourcename.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_Resourcename_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodStatus.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_Status_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodString.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_String_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodString1.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_String1_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodString2.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_String2_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodStringSeverity.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_StringSeverity_sync

The end of the violation section. All the stuff below is FYI purposes only.

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Here is the summary of changes.

You are about to add 12 region tags.

• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/AsyncEchoWithVersionMethod.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_async
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncCreateSetCredentialsProvider.golden:19, tag goldensample_generated_EchoWithVersion_Create_SetCredentialsProvider_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncCreateSetEndpoint.golden:19, tag goldensample_generated_EchoWithVersion_Create_SetEndpoint_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethod.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodFoobarname.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_Foobarname_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodNoargs.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_Noargs_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodResourcename.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_Resourcename_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodStatus.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_Status_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodString.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_String_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodString1.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_String1_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodString2.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_String2_sync
• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/apiversionclient/SyncEchoWithVersionMethodStringSeverity.golden:19, tag goldensample_generated_EchoWithVersion_EchoWithVersionMethod_StringSeverity_sync

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