Application Credential support

[Deydra71]

Jira: OSPRH-20525

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

Reconcile:

On each reconcile, the Manila 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 Manila 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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[softwarefactory-project-zuul]

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

[openshift-ci]

@Deydra71: 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	8dbb266	link	true	/test functional
ci/prow/manila-operator-build-deploy-kuttl	8dbb266	link	true	/test manila-operator-build-deploy-kuttl

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