Build java-monitoring client library

Build with old version of gapic-generator-java

bazelisk build --subcommands --verbose_failures --sandbox_debug --repo_env=LTS=java8 //google/monitoring/v3:google-cloud-monitoring-v3-java

Build with new version of gapic-generator-java

bazelisk build --subcommands --verbose_failures --sandbox_debug //google/monitoring/v3:google-cloud-monitoring-v3-java