Remove simple tests

public/app/features/alerting/specs/alert_tab_specs.ts

-import { describe, it, expect } from 'test/lib/common';
-
-import { AlertTabCtrl } from '../alert_tab_ctrl';
-
-describe('AlertTabCtrl', () => {
-  var $scope = {
-    ctrl: {},
-  };
-
-  describe('with null parameters', () => {
-    it('can be created', () => {
-      var alertTab = new AlertTabCtrl($scope, null, null, null, null, null);
-
-      expect(alertTab).to.not.be(null);
-    });
-  });
-});

public/app/features/dashboard/specs/dashboard_srv_specs.ts

-import { describe, beforeEach, expect } from 'test/lib/common';
-
-import { DashboardSrv } from '../dashboard_srv';
-
-describe('dashboardSrv', function() {
-  var _dashboardSrv;
-
-  beforeEach(() => {
-    _dashboardSrv = new DashboardSrv({}, {}, {});
-  });
-
-  it('should do something', () => {
-    expect(_dashboardSrv).not.to.be(null);
-  });
-});

public/test/specs/app.jest.ts

-import { GrafanaApp } from 'app/app';
-jest.mock('app/routes/routes');
-
-describe('GrafanaApp', () => {
-  var app = new GrafanaApp();
-
-  it('can call inits', () => {
-    expect(app).not.toBe(null);
-  });
-});

public/test/specs/app_specs.ts

-import {describe, it, expect} from 'test/lib/common';
-
-import {GrafanaApp} from 'app/app';
-
-describe('GrafanaApp', () => {
-
-  var app = new GrafanaApp();
-
-  it('can call inits', () => {
-    expect(app).to.not.be(null);
-  });
-});
-
-