Fix: Ignore extra underscored when Object is an RBAC object in objmetadata

[liamchenoweth]

Ref. #487
Skips the test for extra underscores when we are dealing with RBAC objects as they are only restricted to path objects for naming. Included new tests for this new use case

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[liamchenoweth]

/assign @karlkfi

[liamchenoweth]

/assign @mortent

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/lifecycle stale

[karlkfi]

This seems like it might break the ObjMetadata string format which uses underscores as segment delimiters and double underscores as colons. With this change, an RBAC object with double underscores wouldn't make it through a format+parse cycle. Maybe that's an acceptable limitation in order to support single underscores in RBAC names?

I'm not really sure why underscores were originally chosen. It seems like backslashes would have been a better choice, like we used for the depends-on and apply-time-mutation annotations.

Changing the ID format might be possible, but would probably require migration. And it might prohibit downgrades unless we shipped bi-directional migration beforehand, or made it an opt-in feature for a while.

[karlkfi]

/ok-to-test

[karlkfi]

TestParseObjMetadata only tests parsing, unfortunately, not round-trip format+parse. I think this change would break the round-trip.

[k8s-ci-robot]

@liamchenoweth: 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
cli-utils-presubmit-master-stress	d811228	link	true	/test cli-utils-presubmit-master-stress

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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