Yarn 4 Migration (#32253)

Migrates the Overleaf monorepo package manager from npm (v11) to Yarn 4 (v4.9.1) using node-modules linker mode.

GitOrigin-RevId: 50d32ab01955c15e29679eff9e9e9cfb897fab2d

libraries/promise-utils/buildscript.txt

@@ -5,5 +5,6 @@ promise-utils
 --esmock-loader=False
 --is-library=True
 --node-version=24.14.1
+--package-name=@overleaf/promise-utils
 --pipeline-owner=32
 --public-repo=False

libraries/promise-utils/package.json

@@ -4,11 +4,11 @@
   "description": "utilities to help working with promises",
   "main": "index.js",
   "scripts": {
-    "test": "npm run lint && npm run types:check && npm run test:unit",
+    "test": "yarn run lint && yarn run types:check && yarn run test:unit",
     "test:unit": "mocha --exit test/**/*.{js,cjs}",
     "lint": "eslint --cache --cache-location ../../node_modules/.cache/eslint/ --ext .cjs,.js,.jsx,.mjs,.ts --max-warnings 0 --format unix .",
     "lint:fix": "eslint --cache --cache-location ../../node_modules/.cache/eslint/ --fix --ext .cjs,.js,.jsx,.mjs,.ts .",
-    "test:ci": "npm run test:unit",
+    "test:ci": "yarn run test:unit",
     "types:check": "tsc --noEmit"
   },
   "author": "Overleaf (https://www.overleaf.com)",