Remove the integrity hash annotation

Layers 2-4 removed every reader of the actions.github.com/integrity-hash
annotation, so what remained were write-only dead paths. Delete the
annotation constant, all remaining hash helpers that computed it, the
call sites that stamped it onto objects, the integrity-hash fallback in
newResourceCacheObjectRef, and the now-unused AutoscalingListenerSpec.Hash
and EphemeralRunnerSpec.Hash methods.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

apis/actions.github.com/v1alpha1/autoscalinglistener_types.go

@@ -17,7 +17,6 @@ limitations under the License.
 package v1alpha1
 
 import (
-	"github.com/actions/actions-runner-controller/hash"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
@@ -87,10 +86,6 @@ type AutoscalingListenerSpec struct {
 	ListenerConfig *ListenerConfig `json:"listenerConfig,omitempty"`
 }
 
-func (s *AutoscalingListenerSpec) Hash() string {
-	return hash.ComputeTemplateHash(s)
-}
-
 // AutoscalingListenerStatus defines the observed state of AutoscalingListener
 type AutoscalingListenerStatus struct{}
 

apis/actions.github.com/v1alpha1/ephemeralrunner_types.go

@@ -17,7 +17,6 @@ limitations under the License.
 package v1alpha1
 
 import (
-	"github.com/actions/actions-runner-controller/hash"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
@@ -133,10 +132,6 @@ type EphemeralRunnerSpec struct {
 	corev1.PodTemplateSpec `json:",inline"`
 }
 
-func (s *EphemeralRunnerSpec) Hash() string {
-	return hash.ComputeTemplateHash(s)
-}
-
 // EphemeralRunnerStatus defines the observed state of EphemeralRunner
 type EphemeralRunnerStatus struct {
 	// Turns true only if the runner is online.