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

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❌ 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)

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Merge Failed.

This change or one of its cross-repo dependencies was unable to be automatically merged with the current state of its repository. Please rebase the change and upload a new patchset.
Warning:
Error merging github.com/openstack-k8s-operators/keystone-operator for 567,560a7f552956fc9c80fece28fc7e7b01b59c2274

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Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/104fe5a5a91847aa8699e49e6ff38586

❌ openstack-k8s-operators-content-provider FAILURE in 5m 24s
⚠️ cinder-operator-kuttl SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
⚠️ cinder-operator-tempest SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider

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Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/14c11287bb3c4b2eb11c0a1852de2677

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 07m 39s
✔️ cinder-operator-kuttl SUCCESS in 40m 57s
❌ cinder-operator-tempest RETRY_LIMIT in 10m 20s