make featuregate manifest pattern consistent and remove legacy files

[deads2k]

Definitely need to be sure hypershift passes here. A quick scan suggests they're using injection (so we need to update their clusterProfile), but they're ok otherwise.

EDIT: actually, they're doing that here: https://github.com/openshift/hypershift/blob/main/control-plane-operator/controllers/hostedcontrolplane/kas/deployment.go#L791

I think this will "just work"

[openshift-ci]

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[openshift-ci]

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[JoelSpeed]

This is causing hack/verify-payload-featuregates.sh to fail

[deads2k]

/retest

[deads2k]

labelling cleanup

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD bcf33ad and 2 for PR HEAD 676fb69 in total

[openshift-ci]

@deads2k: all tests passed!

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[openshift-bot]

[ART PR BUILD NOTIFIER]

This PR has been included in build ose-cluster-config-api-container-v4.16.0-202403141746.p0.g4caef7f.assembly.stream.el9 for distgit ose-cluster-config-api.
All builds following this will include this PR.