Rename test cases for beta feature validations

[JeromeJu]

Changes

This commit renames the test cases for beta feature validations which previously had the tests constructed to return an error without the feature flags being set. This was no longer the case after the refactor and this commit aims to avoid the confusions.

/kind misc

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Release Notes

NONE

[JeromeJu]

/retest
known flake: #4643

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[wlynch]

/lgtm