feat: add support for multi feature gate on same value

[eggfoobar]

added ability to use multiple feature gates on the same value that graduate to different feature sets at different times

drop DualReplica from TechPreview

[openshift-ci]

Hello @eggfoobar! 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.

[eggfoobar]

/hold

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

Closing in favor of #2283

[openshift-ci]

@eggfoobar: The following test 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/verify-crd-schema	8071877	link	true	/test verify-crd-schema

Full PR test history. Your PR dashboard.

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