Enable ESLint rule unicorn/no-array-for-each, auto-fix all violations, manually address new issues for ~4% time reduction measured via profile-fixture.mjs on Apple Silicon M1.

test/rules/npm/sample-rule.js

@@ -7,13 +7,13 @@ module.exports = {
   "description": "Sample rule",
   "tags": [ "sample" ],
   "function": function rule(params, onError) {
-    params.tokens.forEach((token) => {
+    for (const token of params.tokens) {
       if (token.type === "hr") {
         onError({
           "lineNumber": token.lineNumber,
           "detail": "Sample error for hr"
         });
       }
-    });
+    }
   }
 };