Detect TLS cert secret changes in NodeSet reconciler

[oliashish]

Cert-manager renewals were invisible because cert secrets are owned by the Certificate CR, not the NodeSet. Add label-based detection in secretWatcherFn and hash comparison in checkDeployment to surface redeployment required signal after cert rotation.

Jira: OSPRH-32671

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

[openshift-ci]

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[github-actions]

OpenStackControlPlane CRD Size Report

Metric	Value
CRD JSON size	350002 bytes (342KB)
Base branch size	364822 bytes
Change	-4.06%
Status	yellow — growing

Threshold reference

Color	Range	Meaning
🟢 green	< 300KB	Comfortable
🟡 yellow	300–400KB	Growing
🟠 orange	400–750KB	Concerning
🔴 red	> 750KB	Approaching 1.5MB etcd limit (cut in half to allow space for update)

[openshift-ci]

@oliashish: 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/openstack-operator-build-deploy-kuttl-4-20	e604e71	link	true	/test openstack-operator-build-deploy-kuttl-4-20

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