v20260827-192339

Remove the github-status-test lambda (#8644)

The github-status-test webhook is no longer used: log downloading now
runs through `gha-log-uploader`, driven by the PyTorch bot App.

See #7549.

The traffic to this lambda has dropped to 0 today.
<img width="507" height="270" alt="Screenshot 2026-08-26 at 7 05 09 PM"
src="https://github.com/user-attachments/assets/cae31128-2b6c-4cbf-9f9f-ca474896b252"
/>