The SSH retry matched connection words in any error output. When `mc alias set`
in a backup upload could not reach S3, its "connection refused" output caused a
retry of the full batch, and the second `docker run --name backup-of-<uuid>`
failed with a name conflict that hid the real error.
- Retry only SSH transport failures: exit code 255, or errors without an exit code.
- Keep the remote exit code on deployment command failures.
- Remove a leftover backup helper container in the same upload batch.
Closes#12059
Remove the trackSshRetryEvent() method and its invocation from the SSH retry
flow. This simplifies the retry mechanism and reduces external dependencies for
retry handling.
Andras Bacsai