Run log streaming

In addition to build logs, you can now use the bb CLI to stream bazel run executable output to our servers and view live-updating run logs from the UI.

This gives you a durable record of executable output, making it easy to share logs with teammates, or letting you monitor runs while away from your terminal.

To use it:

bb run //app:server --stream_run_logs

By default, if streaming fails, the executable will continue to run. To fail the command immediately, use --on_stream_run_logs_failure=fail.