Add application credential finalizer management

[Deydra71]

Jira: OSPRH-29269

Application Credential dev-doc: https://github.com/openstack-k8s-operators/dev-docs/blob/main/application_credentials.md

• Tracks the active AC secret name in Status.ApplicationCredentialSecret
• Add openstack.org/heat-ac-consumer finalizer to the AC secret after service config is rendered
• On AC rotation, move the finalizer from the old secret to the new one
• On CR deletion, remove the consumer finalizer from the AC secret before cleaning up the CR

This ensures that the keystone-operator cannot revoke a rotated AC secret while Heat is still consuming it.

2026-04-28T11:55:51Z	INFO	Controllers.Heat	Added consumer finalizer	{"controller": "heat", "controllerGroup": "heat.openstack.org", "controllerKind": "Heat", "Heat": {"name":"heat","namespace":"openstack"}, "namespace": "openstack", "name": "heat", "reconcileID": "82672178-a3a3-4bd4-b3d5-87c6d5853d9b", "object": "ac-heat-aa0a4-secret", "finalizer": "openstack.org/heat-ac-consumer"}
2026-04-28T11:55:51Z	INFO	Controllers.Heat	Removed consumer finalizer	{"controller": "heat", "controllerGroup": "heat.openstack.org", "controllerKind": "Heat", "Heat": {"name":"heat","namespace":"openstack"}, "namespace": "openstack", "name": "heat", "reconcileID": "82672178-a3a3-4bd4-b3d5-87c6d5853d9b", "object": "ac-heat-ba179-secret", "finalizer": "openstack.org/heat-ac-consumer"}

Depends-On: openstack-k8s-operators/keystone-operator#685

Assisted-by: Claude Opus 4.6 noreply@anthropic.com

[openshift-ci]

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