tools: enable no-useless-backreference lint rule

PR-URL: https://github.com/nodejs/node/pull/31400
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

.eslintrc.js

@@ -274,6 +274,7 @@ module.exports = {
       functions: false,
       variables: false,
     }],
+    'no-useless-backreference': 'error',
     'no-useless-call': 'error',
     'no-useless-catch': 'error',
     'no-useless-concat': 'error',