This caused the following issues:
- Slim binaries weren't being updated.
- The coder.tar.ztd was misplaced.
- There is no coder.sha1 file with proper filenames.
This should be reintroduced in a future change with those fixes.
- Adds distinct exit statuses to the bootstrap scripts
- Makes the bootstrap scripts loop forever trying to download the coder agent
- Surfaces and logs the status codes returned by the download tool