Add application credential finalizer management

[Deydra71]

Jira: OSPRH-27509

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/swift-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 Swift is still consuming it.

2026-04-28T11:52:38Z	INFO	Controllers.SwiftProxy	Added consumer finalizer	{"controller": "swiftproxy", "controllerGroup": "swift.openstack.org", "controllerKind": "SwiftProxy", "SwiftProxy": {"name":"swift-proxy","namespace":"openstack"}, "namespace": "openstack", "name": "swift-proxy", "reconcileID": "c1073a8a-7a0e-4fa5-b3f3-055d34e7740b", "object": "ac-swift-29490-secret", "finalizer": "openstack.org/swiftproxy-ac-consumer"}
2026-04-28T11:52:38Z	INFO	Controllers.SwiftProxy	Removed consumer finalizer	{"controller": "swiftproxy", "controllerGroup": "swift.openstack.org", "controllerKind": "SwiftProxy", "SwiftProxy": {"name":"swift-proxy","namespace":"openstack"}, "namespace": "openstack", "name": "swift-proxy", "reconcileID": "c1073a8a-7a0e-4fa5-b3f3-055d34e7740b", "object": "ac-swift-9299b-secret", "finalizer": "openstack.org/swiftproxy-ac-consumer"}

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

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

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❌ openstack-k8s-operators-content-provider FAILURE in 9m 35s
⚠️ swift-operator-kuttl SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
⚠️ swift-operator-tempest SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider

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❌ openstack-k8s-operators-content-provider FAILURE in 4m 02s
⚠️ swift-operator-kuttl SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
⚠️ swift-operator-tempest SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider