Generate and configure Prometheus client certs

[vyzigold]

When TLS and metricStorage are enabled, generate client certificate for Prometheus. This will later be used by Prometheus to access metric exporters which require client certificates.

jira: https://redhat.atlassian.net/browse/OSPRH-33208
Depends-On: openstack-k8s-operators/telemetry-operator#976
Generated-By: Claude-Code claude-opus-4-6

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[github-actions]

OpenStackControlPlane CRD Size Report

Metric	Value
CRD JSON size	364822 bytes (356KB)
Base branch size	365025 bytes
Change	-0.06%
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)

[vyzigold]

/retest

[vyzigold]

Making this a draft for now, because the telemetry-operator PR needs to merge first and afterward we need a dependency bump here before this can be merged. But the code is currently in a state in which I'd like to eventually merge it.

[openshift-ci]

@vyzigold: The following tests 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/functional	28c58ee	link	true	/test functional
ci/prow/openstack-operator-build-deploy-kuttl-4-20	28c58ee	link	true	/test openstack-operator-build-deploy-kuttl-4-20
ci/prow/precommit-check	28c58ee	link	true	/test precommit-check

Full PR test history. Your PR dashboard.

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[centosinfra-prod-github-app]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/4cba951d748b4046b60424b579190860

✔️ openstack-k8s-operators-content-provider SUCCESS in 2h 56m 26s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 36m 53s
❌ cifmw-crc-podified-edpm-baremetal FAILURE in 35m 30s
❌ openstack-operator-tempest-multinode NODE_FAILURE Node(set) request 099-0000161128 failed in 0s
✔️ openstack-operator-edpm-baremetal-minor-update SUCCESS in 2h 33m 35s

[stuggi]

@vyzigold looks good to me.