chore(nextjs): Remove unused types test (#14774)

This is not called anymore anywhere, so I figured we may as well delete
it. Unless there is a reason to keep this around??

Author: mydea

packages/nextjs/package.json

@@ -118,7 +118,6 @@
     "test": "yarn test:unit",
     "test:all": "run-s test:unit",
     "test:unit": "jest",
-    "test:types": "cd test/types && yarn test",
     "test:watch": "jest --watch",
     "vercel:branch": "source vercel/set-up-branch-for-test-app-use.sh",
     "vercel:project": "source vercel/make-project-use-current-branch.sh",