perf(jobs): release protocol connections when background jobs finish

[SebastianKrupinski]

Summary

• Pooled connections live until the process ends, and a cron process runs many jobs for many accounts. Release each account's clients once a job is done with it, including when the remote work fails, so connections don't accumulate across the run.

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI (N/A)