Alerting: Annotation CanUse for receiver resource (#110839)

* add origin to receiver
* populate origin of the receiver
* set CanUse to false if origin is not Grafana
* set provenance if origin is imported
* set Grafana origin by default in conversion API
* set canUse annotation
* reject update\delete operations on resources with origin other than Grafana
* fail to create with wrong origin

pkg/tests/apis/alerting/notifications/receivers/receiver_test.go

@@ -608,6 +608,7 @@ func TestIntegrationAccessControl(t *testing.T) {
 				// Set expected metadata.
 				expectedWithMetadata := expected.Copy().(*v0alpha1.Receiver)
 				expectedWithMetadata.SetInUse(0, nil)
+				expectedWithMetadata.SetCanUse(true)
 				if tc.canUpdate {
 					expectedWithMetadata.SetAccessControl("canWrite")
 				}
@@ -1294,6 +1295,7 @@ func TestIntegrationCRUD(t *testing.T) {
 		receiver.SetAccessControl("canReadSecrets")
 		receiver.SetAccessControl("canAdmin")
 		receiver.SetInUse(0, nil)
+		receiver.SetCanUse(true)
 
 		// Use export endpoint because it's the only way to get decrypted secrets fast.
 		cliCfg := helper.Org1.Admin.NewRestConfig()