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/designateapi-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 Designate is still consuming it.

2026-04-28T11:56:32Z	INFO	Controllers.DesignateAPI	Added consumer finalizer	{"controller": "designateapi", "controllerGroup": "designate.openstack.org", "controllerKind": "DesignateAPI", "DesignateAPI": {"name":"designate-api","namespace":"openstack"}, "namespace": "openstack", "name": "designate-api", "reconcileID": "254cd723-8b76-4917-a7c8-0087a040e4c7", "object": "ac-designate-e70e9-secret", "finalizer": "openstack.org/designateapi-ac-consumer"}
2026-04-28T11:56:32Z	INFO	Controllers.DesignateAPI	Removed consumer finalizer	{"controller": "designateapi", "controllerGroup": "designate.openstack.org", "controllerKind": "DesignateAPI", "DesignateAPI": {"name":"designate-api","namespace":"openstack"}, "namespace": "openstack", "name": "designate-api", "reconcileID": "254cd723-8b76-4917-a7c8-0087a040e4c7", "object": "ac-designate-6444d-secret", "finalizer": "openstack.org/designateapi-ac-consumer"}

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

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

[Deydra71]

Following the discussion in watcher-operator the AC finalizer management is now split into two phases:

• Early phase: adds consumer finalizer to the new AC secret immediately (protects it from premature revocation)
• Late phase: removes consumer finalizer from the old AC secret only after AllSubConditionIsTrue() (all sub-services deployed with new credentials)

This prevents a race condition where rapid AC rotations could revoke credentials still in use by running pods.

[fmount]

/lgtm

[fmount]

The implementation is in line with the other (merged) operators. @abays || @karelyatin for a final approve.

[beagles]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: beagles, Deydra71, fmount

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