Application Credential support

[Deydra71]

Jira: OSPRH-16624

This PR adds end-to-end support for consuming Keystone ApplicationCredentials (AC) in the Cinder operator, enabling Cinder API pods to use AC-based authentication when available.

Reconcile:

On each reconcile, the Cinder API controller checks for an AC Secret (ac-{service}-secret) using the GetApplicationCredentialFromSecret() helper from keystone-operator API:

• If the secret is missing or incomplete, continues using password authentication

• Once the AC Secret is ready with valid AC_ID and AC_SECRET fields, templates AC credentials into Cinder configuration

• Computes hash of Secret contents and stores in configVars to trigger rolling updates when credentials rotate

Depends-On: openstack-k8s-operators/keystone-operator#567

[openshift-ci]

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[openshift-ci]

@Deydra71: 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/functional	1248d00	link	true	/test functional

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[softwarefactory-project-zuul]

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://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/3c44c2e9d98444ca87af3730e212b6d5

❌ openstack-k8s-operators-content-provider FAILURE in 13m 19s
⚠️ cinder-operator-kuttl SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider (non-voting)
⚠️ cinder-operator-tempest SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider (non-voting)

[openshift-merge-robot]

PR needs rebase.

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