OCPBUGS-73945: Allow custom feature gates to be exempted from upgrade blocking

[copejon]

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[openshift-ci]

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[openshift-ci-robot]

@copejon: This pull request references Jira Issue OCPBUGS-73945, which is invalid:

• expected the bug to target either version "4.22." or "openshift-4.22.", but it targets "4.21.z" instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: copejon

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