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/neutronapi-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 Neutron is still consuming it.

2026-04-28T11:54:58.578Z	INFO	Controllers.NeutronAPI	Added consumer finalizer	{"controller": "neutronapi", "controllerGroup": "neutron.openstack.org", "controllerKind": "NeutronAPI", "NeutronAPI": {"name":"neutron","namespace":"openstack"}, "namespace": "openstack", "name": "neutron", "reconcileID": "c8bf38d1-2f9c-4fe9-88ba-1f6f2a701983", "object": "ac-neutron-0dc46-secret", "finalizer": "openstack.org/neutronapi-ac-consumer"}
2026-04-28T11:54:58.589Z	INFO	Controllers.NeutronAPI	Removed consumer finalizer	{"controller": "neutronapi", "controllerGroup": "neutron.openstack.org", "controllerKind": "NeutronAPI", "NeutronAPI": {"name":"neutron","namespace":"openstack"}, "namespace": "openstack", "name": "neutron", "reconcileID": "c8bf38d1-2f9c-4fe9-88ba-1f6f2a701983", "object": "ac-neutron-86ca8-secret", "finalizer": "openstack.org/neutronapi-ac-consumer"}

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

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

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Merge Failed.

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Error merging github.com/openstack-k8s-operators/neutron-operator for 618,67833c8a7a98b29abef2ace6c6d5aed56e50093c

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Merge Failed.

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Error merging github.com/openstack-k8s-operators/neutron-operator for 618,05c20c1d6ccd5dd2ba8fccaef23fcbb68a9883b7

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❌ openstack-k8s-operators-content-provider FAILURE in 10m 37s
⚠️ neutron-operator-tempest-multinode SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider

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❌ openstack-k8s-operators-content-provider FAILURE in 10m 53s
⚠️ neutron-operator-tempest-multinode SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider