Grafana UI: Fix plugin unit test errors (#69210)

* fix(grafana-ui): import from package to prevent import errors occurring in plugin tests

* style(grafana-ui): add e2e-selectors path to restricted imports rule

packages/grafana-ui/.eslintrc

@@ -3,7 +3,7 @@
     "no-restricted-imports": [
       "error",
       {
-        "patterns": ["@grafana/runtime", "@grafana/data/*", "@grafana/ui", "@grafana/e2e"],
+        "patterns": ["@grafana/runtime", "@grafana/data/*", "@grafana/ui", "@grafana/e2e", "@grafana/e2e-selectors/*"],
         "paths": [
           {
             "name": "react-i18next",

packages/grafana-ui/src/components/PanelChrome/HoverWidget.tsx

@@ -2,7 +2,7 @@ import { css, cx } from '@emotion/css';
 import React, { ReactElement, useCallback, useRef, useState } from 'react';
 
 import { GrafanaTheme2 } from '@grafana/data';
-import { selectors as e2eSelectors } from '@grafana/e2e-selectors/src';
+import { selectors as e2eSelectors } from '@grafana/e2e-selectors';
 
 import { useStyles2 } from '../../themes';
 import { Icon } from '../Icon/Icon';