Application Credential support

[Deydra71]

Jira: OSPRH-20521

Adds the end-to-end support for consuming Keystone ApplicationCredentials (AC) in the ironic-operator, enabling IronicAPI,Conductor, Inspector NeutronAGent pods to use AC-based authentication when available.

API changes:

Adds an optional authentication field to the Ironic CRs:

spec.auth.applicationCredentialSecret — name of the Secret that contains the Keystone Application Credential ID and Secret (AC_ID and AC_SECRET).

Reconcile behavior:

Reads spec.auth.applicationCredentialSecret
Attempts to load AC_ID / AC_SECRET from the referenced Secret (via the Keystone helper).
If the secret is missing or incomplete, it falls back to password authentication (the AppCred auth is optional, not an error).

• Once the AC Secret is ready with valid AC_ID and AC_SECRET fields, templates AC credentials into the respective service configuration (ironic.conf, 01-api.conf, 01-inspector.conf, or 01-ironic_neutron_agent.conf)
• Computes hash of Secret contents and stores in configMapVars to trigger rolling updates when credentials rotate
• Separate AppCreds are used for 'ironic' user (IronicAPI, IronicConductor, IronicNeutronAgent, parent Ironic) and 'ironic-inspector' user (IronicInspector)

Depends-On: openstack-k8s-operators/keystone-operator#567

[openshift-ci]

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[softwarefactory-project-zuul]

Merge Failed.

This change or one of its cross-repo dependencies was unable to be automatically merged with the current state of its repository. Please rebase the change and upload a new patchset.
Warning:
Error merging github.com/openstack-k8s-operators/ironic-operator for 656,6b592f6a3f430ea960129d5b540ec9dc59773612

[openshift-ci]

@Deydra71: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/ironic-operator-build-deploy-kuttl	10e4d47	link	true	/test ironic-operator-build-deploy-kuttl

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