TimeRegions: Fixed issue with time regions and tresholds due to angular js upgrade (#29229)

public/app/plugins/panel/graph/thresholds_form.ts

@@ -7,14 +7,16 @@ export class ThresholdFormCtrl {
   disabled: boolean;
 
   /** @ngInject */
-  constructor($scope: any) {
+  constructor(private $scope: any) {}
+
+  $onInit() {
     this.panel = this.panelCtrl.panel;
 
     if (this.panel.alert) {
       this.disabled = true;
     }
 
-    const unbindDestroy = $scope.$on('$destroy', () => {
+    const unbindDestroy = this.$scope.$on('$destroy', () => {
       this.panelCtrl.editingThresholds = false;
       this.panelCtrl.render();
       unbindDestroy();

public/app/plugins/panel/graph/time_regions_form.ts

@@ -8,10 +8,12 @@ export class TimeRegionFormCtrl {
   colorModes: any;
 
   /** @ngInject */
-  constructor($scope: any) {
+  constructor(private $scope: any) {}
+
+  $onInit() {
     this.panel = this.panelCtrl.panel;
 
-    const unbindDestroy = $scope.$on('$destroy', () => {
+    const unbindDestroy = this.$scope.$on('$destroy', () => {
       this.panelCtrl.editingTimeRegions = false;
       this.panelCtrl.render();
       unbindDestroy();