fix: Generator callable generation is based on method type

[lqiu96]

Fixes https://github.com/googleapis/sdk-platform-java/issues/3076

[snippet-bot[bot]]

Here is the summary of possible violations 😱

There is a possible violation for not having product prefix.

• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncGetApiOperation.golden:19, tag goldensample_generated_NamingServiceStubSettings_GetApiOperation_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 1 region tag.

• gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncGetApiOperation.golden:19, tag goldensample_generated_NamingServiceStubSettings_GetApiOperation_sync

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[sonarqubecloud[bot]]

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

Issues
2 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[bot]]

Quality Gate passed for 'java_showcase_integration_tests'

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarCloud