tools: move ESLint to tools/eslint

Greatly simplify how ESLint and its plugins are installed.

PR-URL: https://github.com/nodejs/node/pull/53413
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

test/common/README.md

@@ -472,7 +472,7 @@ Skip the rest of the tests if the current terminal is a dumb terminal
 ### `skipIfEslintMissing()`
 
 Skip the rest of the tests in the current file when `ESLint` is not available
-at `tools/node_modules/eslint`
+at `tools/eslint/node_modules/eslint`
 
 ### `skipIfInspectorDisabled()`
 

test/common/index.js

@@ -517,7 +517,7 @@ function hasMultiLocalhost() {
 
 function skipIfEslintMissing() {
   if (!fs.existsSync(
-    path.join(__dirname, '..', '..', 'tools', 'node_modules', 'eslint'),
+    path.join(__dirname, '..', '..', 'tools', 'eslint', 'node_modules', 'eslint'),
   )) {
     skip('missing ESLint');
   }