AppCred service operator support

[Deydra71]

Jira: OSPRH-16627

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

Reconcile:

On each reconcile, the Swift Proxy 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 Swift PRoxy configuration
Computes hash of Secret contents and stores in configVars to trigger rolling updates when credentials rotate
RBAC permissions:

Added read permissions for secrets resources to allow fetching AC secrets.

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

[cschwede]

Please see my inline comment

[cschwede]

Looks like an unresolved merge conflict

[Deydra71]

Thanks for catching this up! Also I will soon push update to this PR anyway to reflect latest changes in keystone-operator

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[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	139670c	link	true	/test functional
ci/prow/precommit-check	139670c	link	true	/test precommit-check
ci/prow/swift-operator-build-deploy-kuttl	139670c	link	true	/test swift-operator-build-deploy-kuttl

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