Make the Outdated phase revision-aware (#4644)

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

controllers/actions.github.com/ephemeralrunnerset_scaleup_suppression_test.go

@@ -153,6 +153,10 @@ func TestPatchAppliedActionableRevisionStatusClearsFinishedRunnerCleanupPatchID(
 			WithScheme(scheme).
 			WithObjects(object).
 			WithStatusSubresource(&v1alpha1.EphemeralRunnerSet{}).
+			// patchAppliedActionableRevisionStatus lists the child runners to
+			// recompute the phase, so the fake client needs the same index
+			// SetupIndexers registers on the manager.
+			WithIndex(&v1alpha1.EphemeralRunner{}, resourceOwnerKey, newGroupVersionOwnerKindIndexer("EphemeralRunnerSet")).
 			Build()
 	}