Add CCT-Tests-Unit to Test Coverage

[granluo]

No description provided.

[google-oss-bot]

Coverage Report

Affected SDKs

• GoogleDataTransport-ios-GoogleDataTransport.framework

  SDK overall coverage changed from ? (3615a4c) to 51.94% (6e2be74) by ?.

  Click to show coverage changes in 22 files.

  Filename	Base (3615a4c)	Head (6e2be74)	Diff
  GDTCCTCompressionHelper.m	?	87.14%	?
  GDTCCTNanopbHelpers.m	?	58.82%	?
  GDTCCTUploadOperation.m	?	91.17%	?
  GDTCCTUploader.m	?	92.57%	?
  GDTCORAssert.m	?	0.00%	?
  GDTCORClock.m	?	69.47%	?
  GDTCORConsoleLogger.m	?	20.69%	?
  GDTCORDirectorySizeTracker.m	?	63.64%	?
  GDTCOREndpoints.m	?	100.00%	?
  GDTCOREvent+GDTCCTSupport.m	?	37.56%	?
  GDTCOREvent.m	?	64.37%	?
  GDTCORFlatFileStorage+Promises.m	?	31.43%	?
  GDTCORFlatFileStorage.m	?	22.30%	?
  GDTCORLifecycle.m	?	42.17%	?
  GDTCORPlatform.m	?	52.32%	?
  GDTCORReachability.m	?	78.05%	?
  GDTCORRegistrar.m	?	68.79%	?
  GDTCORStorageEventSelector.m	?	100.00%	?
  GDTCORTransformer.m	?	0.00%	?
  GDTCORTransport.m	?	0.00%	?
  GDTCORUploadBatch.m	?	100.00%	?
  GDTCORUploadCoordinator.m	?	63.16%	?

Test Logs

• Head (6e2be749): https://github.com/google/GoogleDataTransport/actions/runs/698941401

[granluo]

Add 'CCT-Tests-Unit' to code coverage and also fix a failure of code coverage in post submits, which causes a test result not uploaded. 'Generate report' job will be skipped in post submits.