tools: add .mjs linting for Windows

Backport-PR-URL: #19496
PR-URL: #18569
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>

vcbuild.bat

@@ -536,7 +536,7 @@ if defined lint_js_ci goto lint-js-ci
 if not defined lint_js goto exit
 if not exist tools\eslint goto no-lint
 echo running lint-js
-%config%\node tools\eslint\bin\eslint.js --cache --rule "linebreak-style: 0" --rulesdir=tools\eslint-rules --ext=.js,.md benchmark doc lib test tools
+%config%\node tools\eslint\bin\eslint.js --cache --rule "linebreak-style: 0" --rulesdir=tools\eslint-rules --ext=.js,.mjs,.md benchmark doc lib test tools
 goto exit
 
 :lint-js-ci