DO-NOT-MERGE: Add unit tests that prove bug OCPBUGS-63228

[liouk]

This PR contains proof unit tests for the fix in #211. The tests will also be added to that PR and must pass there.

Note that we are expecting TestRemoveUserFromGroup_DoesNotMutateCachedObject/remove_first_user_(case_0) to pass anyway because Users[1:] is a sub-slice that doesn't mutate the array

/hold

[liouk]

/test unit

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@liouk: 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/unit	2ee8e88	link	true	/test unit

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