WIP: Graduate VolumeGroupSnapshots to GA

[jsafrane]

Just testing pass rate of the VolumeGroupSnapshots tests.
Do not merge, the feature is not ready!

/hold

[openshift-ci]

Hello @jsafrane! 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: jsafrane
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[openshift-ci]

@jsafrane: 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/e2e-aws-serial-techpreview	a1f03d3	link	true	/test e2e-aws-serial-techpreview
ci/prow/e2e-aws-serial	a1f03d3	link	true	/test e2e-aws-serial
ci/prow/verify-feature-promotion	a1f03d3	link	true	/test verify-feature-promotion
ci/prow/e2e-aws-ovn-hypershift-conformance	a1f03d3	link	true	/test e2e-aws-ovn-hypershift-conformance
ci/prow/e2e-aws-ovn	a1f03d3	link	true	/test e2e-aws-ovn
ci/prow/e2e-aws-serial-techpreview-1of2	a1f03d3	link	true	/test e2e-aws-serial-techpreview-1of2

Full PR test history. Your PR dashboard.

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