Revert gcp custom endpoints

[barbacbd]

Revert "CORS-4184: Add STS IAMCredentials and OAuth Service for GCP Endpoint Overrides"

This reverts commit c2fc60c983e28dd78953cb61d4f4e9a23279d33d.

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

This reverts commit 0cd96580db63e6b020902c0d257918540beb478c.

Revert "CORS-3842: Add API Updates for GCP Custom API Endpoints"

This reverts commit eafe808c2cd2b5d636dad29bed7c9edd22602dcd.

The featuregate is no needed with the new solution to the epic. The cluster components are no longer touched, only the openshift installer and CCM are using endpoint overrides. The CCM already contained the code for endpoint overrides.

[openshift-ci-robot]

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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/minor-e2e-upgrade-minor	1d739ad	link	true	/test minor-e2e-upgrade-minor
ci/prow/integration	1d739ad	link	true	/test integration
ci/prow/verify-crdify	1d739ad	link	true	/test verify-crdify
ci/prow/verify-crd-schema	1d739ad	link	true	/test verify-crd-schema
ci/prow/okd-scos-e2e-aws-ovn	1d739ad	link	false	/test okd-scos-e2e-aws-ovn

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[barbacbd]

Closing this in favor of splitting the work. The first pr here: #2576 will remove the endpoints. The second will remove the feature gate when we can.