Dashboard: Remove isTimezoneUtc (#24754)

public/app/plugins/panel/graph/specs/time_region_manager.test.ts

@@ -13,9 +13,7 @@ describe('TimeRegionManager', () => {
         },
         panelCtrl: {
           range: {},
-          dashboard: {
-            isTimezoneUtc: () => false,
-          },
+          dashboard: {},
         },
       };
 

public/test/specs/helpers.ts

@@ -57,9 +57,6 @@ export function ControllerTestContext(this: any) {
       self.dashboard.getTimezone = () => {
         return self.isUtc ? 'utc' : 'browser';
       };
-      self.dashboard.isTimezoneUtc = () => {
-        return self.isUtc;
-      };
 
       $rootScope.appEvent = sinon.spy();
       $rootScope.onAppEvent = sinon.spy();