Dashboards testing: Update failing test (#104966)

fix: update dashboards test

public/app/plugins/datasource/dashboard/datasource.test.ts

@@ -108,12 +108,15 @@ describe('DashboardDatasource', () => {
   });
 
   it('Should not mutate field state in dataframe', () => {
+    jest.useFakeTimers();
     const { observable } = setup({ refId: 'A', panelId: 1, withTransforms: true });
 
     let rsp: DataQueryResponse | undefined;
 
     const test = observable.subscribe({ next: (data) => (rsp = data) });
 
+    jest.runAllTimers();
+
     // modifying series in dashboard DS should not affect the original dataframe
     rsp!.data[0].fields[0].state = {
       calcs: { sum: 3 },
@@ -123,6 +126,8 @@ describe('DashboardDatasource', () => {
 
     observable.subscribe({ next: (data) => (rsp = data) });
 
+    jest.runAllTimers();
+
     // on further emissions the result should be the unmodified original dataframe
     expect(rsp!.data[0].fields[0].state).toEqual({});
   });