tools: enable ESLint no-constant-condition rule

PR-URL: #41463
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>

.eslintrc.js

@@ -179,6 +179,7 @@ module.exports = {
     'no-class-assign': 'error',
     'no-confusing-arrow': 'error',
     'no-const-assign': 'error',
+    'no-constant-condition': ['error', { checkLoops: false }],
     'no-constructor-return': 'error',
     'no-control-regex': 'error',
     'no-debugger': 'error',