Exclude bench fixtures and bench script from project lint

The bench fixtures are Ember app source files (ES modules) that aren't
meant to be linted by the project's own eslint config (which uses
sourceType: 'script').

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

Author: NullVoxPopuli

eslint.config.js

@@ -239,6 +239,8 @@ module.exports = [
       'lib/recommended-rules-gjs.js',
       'lib/recommended-rules-gts.js',
       'tests/__snapshots__/',
+      'tests/bench/',
+      'tests/lint.bench.mjs',
 
       // # Contains <template> in js markdown
       'docs/rules/no-empty-glimmer-component-classes.md',