Relink automation dep before compile

Just always relink to avoid issues with the build cache not restoring
links.

Fixes #80729

test/smoke/package.json

@@ -4,6 +4,7 @@
   "main": "./src/main.js",
   "scripts": {
     "postinstall": "npm run compile",
+    "precompile": "yarn add vscode-automation@link:../automation",
     "compile": "yarn --cwd ../automation compile && tsc",
     "watch": "concurrently \"yarn --cwd ../automation watch --preserveWatchOutput\" \"tsc --watch --preserveWatchOutput\"",
     "mocha": "mocha"