tests:feat:integ: adc for direct

[acpana]

This is a companion PR to #3314 but for our integ (post submit) dynamic test suite. Tested out w a resource I am working on. Prior to this change, there's no plumbing for the X-goog-user-project header in the actual test setup.

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[maqiuyujoyce]

@acpana have you verified locally for all resources that this config works? I can't be sure if the following logic works for all non-direct resources, so could you use the code from master HEAD to create a baseline test result, and then run the test with this change to ensure the test result is the same (ish)?

	p := testgcp.GetDefaultProject(t)
	// technically this would be sufficient for TF and DCL controllers
	// to set the BillingProject as the resource project that is being used.
	kccConfig.UserProjectOverride = true