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/octaviaapi-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 Octavia is still consuming it.

2026-04-28T11:53:27Z	INFO	Controllers.OctaviaAPI	Added consumer finalizer	{"controller": "octaviaapi", "controllerGroup": "octavia.openstack.org", "controllerKind": "OctaviaAPI", "OctaviaAPI": {"name":"octavia-api","namespace":"openstack"}, "namespace": "openstack", "name": "octavia-api", "reconcileID": "e303e661-8bd8-4f4a-b374-aea01506cc6d", "object": "ac-octavia-dd60c-secret", "finalizer": "openstack.org/octaviaapi-ac-consumer"}
2026-04-28T11:53:27Z	INFO	Controllers.OctaviaAPI	Removed consumer finalizer	{"controller": "octaviaapi", "controllerGroup": "octavia.openstack.org", "controllerKind": "OctaviaAPI", "OctaviaAPI": {"name":"octavia-api","namespace":"openstack"}, "namespace": "openstack", "name": "octavia-api", "reconcileID": "e303e661-8bd8-4f4a-b374-aea01506cc6d", "object": "ac-octavia-ff4f3-secret", "finalizer": "openstack.org/octaviaapi-ac-consumer"}

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

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

[Deydra71]

/test octavia-operator-build-deploy-kuttl

[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

[gthiemonge]

/approve

[openshift-ci]

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

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