Refactor: remove DefaultsConfigReconciler

The DefaultsConfigReconciler maintained config-hash annotations on
workloads with kagenti.io/type that were not managed by an AgentRuntime
CR. With the new ValidatingAdmissionPolicy enforcing that the label can
only be set via an AgentRuntime, no unmanaged workloads can exist.
The reconciler was effectively a no-op and is now removed along with
its tests and the ComputeDefaultsOnlyHash helper.

Signed-off-by: Daniels Nagornuks <dnagornu@redhat.com>

Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com>

Author: rh-dnagornuks

kagenti-operator/cmd/main.go

@@ -770,15 +770,6 @@ func main() {
 			os.Exit(1)
 		}
 
-		// Defaults-only config reconciler: propagates ConfigMap changes to
-		// workloads that have kagenti.io/type but no AgentRuntime CR.
-		if err = (&injector.DefaultsConfigReconciler{
-			Client: mgr.GetClient(),
-			Scheme: mgr.GetScheme(),
-		}).SetupWithManager(mgr); err != nil {
-			setupLog.Error(err, "unable to create controller", "controller", "DefaultsConfig")
-			os.Exit(1)
-		}
 	}
 	// +kubebuilder:scaffold:builder