tools: remove eslint rule no-let-in-for-declaration

Author: gengjiawen

lib/.eslintrc.yaml

@@ -17,7 +17,6 @@ rules:
       message: "Use an error exported by the internal/errors module."
   # Custom rules in tools/eslint-rules
   node-core/require-globals: error
-  node-core/no-let-in-for-declaration: error
   node-core/lowercase-name-for-primitive: error
   node-core/non-ascii-character: error
 globals:

test/parallel/test-eslint-no-let-in-for-declaration.js

@@ -37,7 +37,6 @@ parallel/test-eslint-duplicate-requires: SLOW
 parallel/test-eslint-eslint-check: SLOW
 parallel/test-eslint-inspector-check: SLOW
 parallel/test-eslint-lowercase-name-for-primitive: SLOW
-parallel/test-eslint-no-let-in-for-declaration: SLOW
 parallel/test-eslint-no-unescaped-regexp-dot: SLOW
 parallel/test-eslint-number-isnan: SLOW
 parallel/test-eslint-prefer-assert-iferror: SLOW