Monorepo migration breaks the pre-commit mvn test step #1270
Description
Although #1253 has been resolved, the mvn test step is now failing.
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.10.1:compile (default-compile) on project gapic-generator-java: Compilation failure: Compilation failure:
[ERROR] /gapic-generator-java/gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/rest/ServiceClientTestClassComposer.java:[19,43] package com.google.api.gax.httpjson.testing does not exist
[ERROR] /gapic-generator-java/gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/rest/ServiceClientTestClassComposer.java:[24,38] package com.google.api.gax.rpc.testing does not exist
[ERROR] /gapic-generator-java/gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/grpc/ServiceClientTestClassComposer.java:[18,39] package com.google.api.gax.grpc.testing does not exist
[ERROR] /gapic-generator-java/gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/grpc/ServiceClientTestClassComposer.java:[19,39] package com.google.api.gax.grpc.testing does not exist
[ERROR] /gapic-generator-java/gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/grpc/ServiceClientTestClassComposer.java:[20,39] package com.google.api.gax.grpc.testing does not exist
[ERROR] /gapic-generator-java/gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/grpc/ServiceClientTestClassComposer.java:[21,39] package com.google.api.gax.grpc.testing does not exist
Attempting to fix this also unveils further issues with the next bazel integration test invocation.