[Bug]: Run doesn't show Waiting runner limit exceeded in Error #3545

Steps to reproduce

1. DSTACK_RUNNER_DOWNLOAD_URL=123 dstack server -yd
2. Sumit a run
3. Ensure Events show

Job status changed PROVISIONING -> TERMINATING. Termination reason: WAITING_RUNNER_LIMIT_EXCEEDED

Actual behaviour

1. The Status in both CLI and UI is Error but the Error is empty

Expected behaviour

1. The Error should be Waiting runner limit exceeded (similar to Waiting instance limit exceeded)

dstack version

0.20.7

Server logs

Additional information

Most likely we don't have a proper mapping, e.g. here (or somewhere else).