chore(eslint): remove unused rule config

Author: wjhsf

eslint.config.mjs

@@ -364,11 +364,6 @@ export default tseslint.config(
                 ...globals.browser,
             },
         },
-
-        rules: {
-            'no-var': 'off',
-            'prefer-rest-params': 'off',
-        },
     },
     {
         files: ['packages/@lwc/integration-karma/**'],
@@ -383,11 +378,6 @@ export default tseslint.config(
                 ...globals.jasmine,
             },
         },
-
-        rules: {
-            'no-var': 'off',
-            'prefer-rest-params': 'off',
-        },
     },
     {
         files: ['packages/@lwc/synthetic-shadow/**'],