CORS-4041: Remove the TagManager from the GCP Custom Endpoints

[barbacbd]

** The tag manager or tagging does appear to have a service in GCP, but this particular one is NOT used. Instead openshift uses the cloud resource manager service, so there is no need to support Tag Manager.

[openshift-ci-robot]

@barbacbd: This pull request references CORS-4041 which is a valid jira issue.

In response to this:

** The tag manager or tagging does appear to have a service in GCP, but this particular one is NOT used. Instead openshift uses the cloud resource manager service, so there is no need to support Tag Manager.

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[openshift-ci]

Hello @barbacbd! Some important instructions when contributing to openshift/api:
API design plays an important part in the user experience of OpenShift and as such API PRs are subject to a high level of scrutiny to ensure they follow our best practices. If you haven't already done so, please review the OpenShift API Conventions and ensure that your proposed changes are compliant. Following these conventions will help expedite the api review process for your PR.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: barbacbd
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[barbacbd]

/cc @JoelSpeed

[openshift-ci]

@barbacbd: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/integration	f990078	link	true	/test integration
ci/prow/verify-crd-schema	f990078	link	true	/test verify-crd-schema
ci/prow/okd-scos-e2e-aws-ovn	f990078	link	false	/test okd-scos-e2e-aws-ovn

Full PR test history. Your PR dashboard.

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[JoelSpeed]

When did this API ship initially? What is happening in the cluster today for folks who already specify this value? What will happen when we drop support? Do you have any idea how many people this change might affect?

[JoelSpeed]

What happens to existing resources when you remove this value? This API has shipped so to be able to remove a value we would need to be certain that it won't break existing resources.

Can you please add a ratcheting validation test (see tests/README.md) to make sure this change will allow existing resources with this value set to:

• Update the field itself to remove the bad value
• Update the field value to add a new value
• Update other fields around the field while leaving an invalid value in place