Add VPCSC test.

[steinwaywhw]

This new file is added in order to test client lib compatibility of VPC SC. The tests are auto-generated from the service definition of the monitoring API. The tests can be run inside or outside of VPC service perimeter. The input to the script should be the following environment variables.

PROJECT_ID: a project that is inside the VPC perimeter.
GOOGLE_CLOUD_TESTS_VPCSC_OUTSIDE_PERIMETER_PROJECT: a project that is outside the VPC perimeter.

[codecov]

Codecov Report

Merging #5006 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #5006      +/-   ##
============================================
- Coverage     50.32%   50.31%   -0.01%     
  Complexity    23668    23668              
============================================
  Files          2238     2238              
  Lines        226059   226059              
  Branches      24959    24959              
============================================
- Hits         113754   113751       -3     
- Misses       103704   103707       +3     
  Partials       8601     8601

Impacted Files	Coverage Δ	Complexity Δ
...om/google/cloud/logging/MonitoredResourceUtil.java	50% <0%> (-0.93%)	8% <0%> (ø)
...src/main/java/com/google/cloud/ServiceOptions.java	40.61% <0%> (-0.88%)	27% <0%> (ø)
...e/cloud/datacatalog/v1beta1/DataCatalogClient.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...om/google/cloud/vision/v1/ProductSearchClient.java	61.39% <0%> (ø)	76% <0%> (ø)	⬇️
...atalabeling/v1beta1/DataLabelingServiceClient.java	83.52% <0%> (ø)	83% <0%> (ø)	⬇️
...ud/translate/v3beta1/TranslationServiceClient.java	67.92% <0%> (ø)	24% <0%> (ø)	⬇️

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