Revert "Rm additional file check for scheduled tests (#11192)" (#11297)

This reverts commit ff90bb5.

Requires #11296 to merge first.

Author: obi1kenobi

.github/workflows/scheduled_test.yml

@@ -63,3 +63,15 @@ jobs:
           ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
         run: |
           make scheduled_tests
+
+      - name: Ensure the tests did not create any additional files
+        shell: bash
+        run: |
+          set -eu
+
+          STATUS="$(git status)"
+          echo "$STATUS"
+
+          # grep will exit non-zero if the target message isn't found,
+          # and `set -e` above will cause the step to fail.
+          echo "$STATUS" | grep 'nothing to commit, working tree clean'