[epic] Fix log streaming

[ehmicky]

There are several issues in the buildbot related to logs:

• [ ] empty lines get removed: https://github.com/netlify/buildbot/issues/595
• [x] logs get truncated: https://github.com/netlify/buildbot/issues/384
• [ ] logs from @netlify/build and the buildbot get interleaved: https://github.com/netlify/buildbot/issues/673
• [x] log lines get broken down to several lines: https://github.com/netlify/buildbot/issues/601
• [x] odd error messages a the end: https://github.com/netlify/buildbot/issues/627
• [ ] too many log messages: https://github.com/netlify/buildbot/issues/682
• [x] bold/italic/underline do not work: https://github.com/netlify/netlify-react-ui/issues/7308

Netlify Build tries to patch this with three things that are basically hacks and that only work around few of those issues:

• instead of streaming logs, buffer them. This negatively impacts DX since users need to wait for a Build plugin event handler to complete to see its logs (instead of seeing in real-time). This also prevents a workaround for the logs truncating issue from working (#1147).
• wait for an additional second at the end of all builds
• use this terrible hack (which probably does not completely work) to wait for plugins stdout/stderr to be flushed out before ending @netlify/build

We need to get a more proper support for log streaming.

[mheffner]

Marking as epic, several of these efforts are ongoing. There's definitely a lot we can do to improve logging.

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had activity in 1 year. It will be closed in 14 days if no further activity occurs. Thanks!

[github-actions[bot]]

This issue was closed because it had no activity for over 1 year.