Chore: Set tsconfig target to ES6 (#44842)

* chore(tsconfig): update grafana/tsconfig to 1.2.0 for outputting es6

* rewrote the unsubscription part to use first().

* test: update failing tests to work with es6 output

* removed bug where we dispatch a promise instead of an array of ritch history.

Co-authored-by: Marcus Andersson <marcus.andersson@grafana.com>

public/app/features/query/state/DashboardQueryRunner/DashboardQueryRunner.test.ts

@@ -1,5 +1,5 @@
 import { throwError } from 'rxjs';
-import { delay } from 'rxjs/operators';
+import { delay, first } from 'rxjs/operators';
 import { setDataSourceSrv } from '@grafana/runtime';
 import { AlertState, AlertStateInfo } from '@grafana/data';
 
@@ -60,18 +60,19 @@ function expectOnResults(args: {
   expect: (results: DashboardQueryRunnerResult) => void;
 }) {
   const { runner, done, panelId, expect: expectCallback } = args;
-  const subscription = runner.getResult(panelId).subscribe({
-    next: (value) => {
-      try {
-        expectCallback(value);
-        subscription?.unsubscribe();
-        done();
-      } catch (err) {
-        subscription?.unsubscribe();
-        done.fail(err);
-      }
-    },
-  });
+  runner
+    .getResult(panelId)
+    .pipe(first())
+    .subscribe({
+      next: (value) => {
+        try {
+          expectCallback(value);
+          done();
+        } catch (err) {
+          done.fail(err);
+        }
+      },
+    });
 }
 
 describe('DashboardQueryRunnerImpl', () => {

public/app/plugins/datasource/opentsdb/specs/query_ctrl.test.ts

@@ -17,7 +17,7 @@ describe('OpenTsQueryCtrl', () => {
     refresh: () => {},
   };
 
-  OpenTsQueryCtrl.prototype = Object.assign(OpenTsQueryCtrl.prototype, ctx);
+  Object.assign(OpenTsQueryCtrl.prototype, ctx);
 
   beforeEach(() => {
     ctx.ctrl = new OpenTsQueryCtrl({}, {} as any);

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

@@ -10,11 +10,9 @@ import { dateTime, EventBusSrv } from '@grafana/data';
 import { DashboardModel } from '../../../../features/dashboard/state';
 
 jest.mock('../event_manager', () => ({
-  EventManager: () => {
-    return {
-      on: () => {},
-      addFlotEvents: () => {},
-    };
+  EventManager: class EventManagerMock {
+    on() {}
+    addFlotEvents() {}
   },
 }));
 
@@ -47,7 +45,7 @@ describe('grafanaGraph', () => {
         lightTheme: false,
       },
     };
-    GraphCtrl.prototype = {
+    Object.assign(GraphCtrl.prototype, {
       ...MetricsPanelCtrl.prototype,
       ...PanelCtrl.prototype,
       ...GraphCtrl.prototype,
@@ -96,7 +94,7 @@ describe('grafanaGraph', () => {
       annotationsSrv: {
         getAnnotations: () => Promise.resolve({}),
       },
-    } as any;
+    }) as any;
 
     ctx.data = [];
     ctx.data.push(