CNTRLPLANE-1724: Add OTE helper functions in test/library/ote

[gangwgr]

Add two new OTE helper functions for common test scenarios:

1. WaitForAPIServerRollout: Waits for all API server pods to be recreated after a configuration change. Unlike WaitForAPIServerToStabilizeOnTheSameRevision, this specifically waits for NEW pods to replace old ones.

2. WaitForFeatureGateEnabled: Waits for a specific feature gate to be enabled in the cluster by polling the FeatureGate resource.

These functions are needed for testing configuration changes and feature gate
enablement in operator e2e tests, particularly for EventTTL configuration tests
in cluster-kube-apiserver-operator.

[openshift-ci]

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[openshift-ci]

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[openshift-ci-robot]

@gangwgr: This pull request references CNTRLPLANE-1724 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the sub-task to target the "4.21.0" version, but no target version was set.

In response to this:

Add two new OTE helper functions for common test scenarios:

1. WaitForAPIServerRollout: Waits for all API server pods to be recreated after a configuration change. Unlike WaitForAPIServerToStabilizeOnTheSameRevision, this specifically waits for NEW pods to replace old ones.

2. WaitForFeatureGateEnabled: Waits for a specific feature gate to be enabled in the cluster by polling the FeatureGate resource.

These functions are needed for testing configuration changes and feature gate
enablement in operator e2e tests, particularly for EventTTL configuration tests
in cluster-kube-apiserver-operator.

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[wangke19]

Discussion in slack for this: https://redhat-internal.slack.com/archives/CC3CZCQHM/p1762941938449059?thread_ts=1762421042.028719&cid=CC3CZCQHM
https://github.com/openshift/library-go/tree/master/test would hold test helpers we use to create test cases across our repositories
https://github.com/openshift/library-go/blob/master/test/library/apiserver/apiserver.go we have similar func.

[openshift-ci]

@gangwgr: all tests passed!

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[gangwgr]

Discussion in slack for this: https://redhat-internal.slack.com/archives/CC3CZCQHM/p1762941938449059?thread_ts=1762421042.028719&cid=CC3CZCQHM https://github.com/openshift/library-go/tree/master/test would hold test helpers we use to create test cases across our repositories https://github.com/openshift/library-go/blob/master/test/library/apiserver/apiserver.go we have similar func.

Moved funcs to test. I checked existing funcs have different behaviour