Add e2e test for exemplars flow (#33972)

* Add e2e test for exemplars flow

* Check if data source is created

* Lets see what is going on

* Try again

* Updating the image maybe?

* Revert "Updating the image maybe?"

This reverts commit 968b44b0d9.

* Try with force

* Use electron

* Wait for new url?

* Wait?????

* Should be good now

* Revert e2e recording

public/app/plugins/datasource/prometheus/configuration/ExemplarsSettings.tsx

@@ -1,5 +1,6 @@
-import { Button } from '@grafana/ui';
 import { css } from '@emotion/css';
+import { selectors } from '@grafana/e2e-selectors';
+import { Button } from '@grafana/ui';
 import React from 'react';
 import { ExemplarTraceIdDestination } from '../types';
 import ExemplarSetting from './ExemplarSetting';
@@ -36,6 +37,7 @@ export function ExemplarsSettings({ options, onChange }: Props) {
 
       <Button
         variant="secondary"
+        aria-label={selectors.components.DataSource.Prometheus.configPage.exemplarsAddButton}
         className={css`
           margin-bottom: 10px;
         `}