add mocha eslint plugin to warn about exclusive tests (it.only)

eslint.config.mjs

@@ -1,21 +1,30 @@
 import globals from 'globals'
-import pluginJs from '@eslint/js'
-import pluginCypress from 'eslint-plugin-cypress/flat'
-import pluginPrettier from 'eslint-plugin-prettier/recommended'
+import jsPlugin from '@eslint/js'
+import cypressPlugin from 'eslint-plugin-cypress/flat'
+import prettierPlugin from 'eslint-plugin-prettier/recommended'
+import mochaPlugin from 'eslint-plugin-mocha'
 
 // NOTE: This config is only used for running ESLint on the Cypress tests. Frontend and backend use their own configs.
 
 /** @type {import('eslint').Linter.Config[]} */
 export default [
-  {
-    languageOptions: { globals: globals.browser },
-  },
+  mochaPlugin.configs.flat.recommended,
+  cypressPlugin.configs.recommended,
 
   {
-    files: ['cypress/*.js'],
-    rules: pluginJs.configs.recommended.rules,
+    rules: {
+      ...jsPlugin.configs.recommended.rules,
+      'mocha/no-mocha-arrows': 'off',
+      'mocha/no-skipped-tests': 'off',
+      'mocha/max-top-level-suites': 'off',
+      'mocha/no-top-level-hooks': 'off',
+      'mocha/no-sibling-hooks': 'off',
+    },
+
+    languageOptions: {
+      globals: globals.browser,
+    },
   },
 
-  pluginCypress.configs.recommended,
-  pluginPrettier,
+  prettierPlugin,
 ]