Remove github-api-cache-duration flag and code (#1631)

This removes the flag and code for the legacy GitHub API cache. We already migrated to fully use the new HTTP cache based API cache functionality which had been added via #1127 and available since ARC 0.22.0. Since then, the legacy one had been no-op and therefore removing it is safe.

Ref #1412

controllers/horizontalrunnerautoscaler_controller.go

@@ -51,7 +51,6 @@ type HorizontalRunnerAutoscalerReconciler struct {
 	Log                   logr.Logger
 	Recorder              record.EventRecorder
 	Scheme                *runtime.Scheme
-	CacheDuration         time.Duration
 	DefaultScaleDownDelay time.Duration
 	Name                  string
 }

controllers/integration_test.go

@@ -138,13 +138,12 @@ func SetupIntegrationTest(ctx2 context.Context) *testEnvironment {
 		Expect(err).NotTo(HaveOccurred(), "failed to setup runnerdeployment controller")
 
 		autoscalerController := &HorizontalRunnerAutoscalerReconciler{
-			Client:        mgr.GetClient(),
-			Scheme:        scheme.Scheme,
-			Log:           logf.Log,
-			GitHubClient:  multiClient,
-			Recorder:      mgr.GetEventRecorderFor("horizontalrunnerautoscaler-controller"),
-			CacheDuration: 1 * time.Second,
-			Name:          controllerName("horizontalrunnerautoscaler"),
+			Client:       mgr.GetClient(),
+			Scheme:       scheme.Scheme,
+			Log:          logf.Log,
+			GitHubClient: multiClient,
+			Recorder:     mgr.GetEventRecorderFor("horizontalrunnerautoscaler-controller"),
+			Name:         controllerName("horizontalrunnerautoscaler"),
 		}
 		err = autoscalerController.SetupWithManager(mgr)
 		Expect(err).NotTo(HaveOccurred(), "failed to setup autoscaler controller")