fix(app-check, expo): ensure config plugin is built before using (#7704)

Author: chsdwn

packages/app-check/package.json

@@ -8,7 +8,9 @@
   "scripts": {
     "build": "genversion --semi lib/version.js",
     "build:clean": "rimraf android/build && rimraf ios/build",
-    "prepare": "yarn run build"
+    "build:plugin": "rimraf plugin/build && tsc --build plugin",
+    "lint:plugin": "eslint plugin/src/*",
+    "prepare": "yarn run build && yarn run build:plugin"
   },
   "repository": {
     "type": "git",