chore(tools): add jsx-a11y Eslint plugin (#38438)

* chore(tools): add a11y eslint plugin

* fix: use Gatsby's a11y eslint rules

* fix(search): remove unnecessary mouse listeners

client/src/components/search/searchBar/NoHitsSuggestion.js

@@ -1,14 +1,9 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 
-const NoHitsSuggestion = ({ title, handleMouseEnter, handleMouseLeave }) => {
+const NoHitsSuggestion = ({ title }) => {
   return (
-    <div
-      className={'no-hits-footer fcc_suggestion_item'}
-      onMouseEnter={handleMouseEnter}
-      onMouseLeave={handleMouseLeave}
-      role='region'
-    >
+    <div className={'no-hits-footer fcc_suggestion_item'} role='region'>
       <span className='hit-name'>{title}</span>
     </div>
   );

client/src/components/search/searchBar/SearchHits.js

@@ -59,11 +59,7 @@ const CustomHits = connectHits(
               key={hit.objectID}
             >
               {noHits ? (
-                <NoHitsSuggestion
-                  handleMouseEnter={handleMouseEnter}
-                  handleMouseLeave={handleMouseLeave}
-                  title={noHitsTitle}
-                />
+                <NoHitsSuggestion title={noHitsTitle} />
               ) : (
                 <Suggestion
                   handleMouseEnter={handleMouseEnter}