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.

API changes:

Adds an optional authentication field to the Cinder API CR:

spec.auth.applicationCredentialSecret — name of the Secret that contains the Keystone Application Credential ID and Secret (AC_ID and AC_SECRET).

Reconcile behavior:

Reads spec.auth.applicationCredentialSecret
Attempts to load AC_ID / AC_SECRET from the referenced Secret (via the Keystone helper).
If the secret is missing or incomplete, it falls back to password authentication (the AppCred auth is optional, not an error).

• 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)
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❌ openstack-k8s-operators-content-provider FAILURE in 5m 24s
⚠️ cinder-operator-kuttl SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
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✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 07m 39s
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❌ openstack-k8s-operators-content-provider FAILURE in 6m 46s
⚠️ cinder-operator-kuttl SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
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❌ openstack-k8s-operators-content-provider FAILURE in 6m 27s
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