Remove experimental worker logs setting

[abrookins]

Worker logs are no longer experimental, so this PR removes references to the setting. We still want to avoid sending worker logs to open-source API servers until they support worker logs, though, so we use the existence of a backend_id on worker logs as a proxy for whether or not the worker is connected to Cloud. (Only workers connected to Cloud emit logs with worker IDs attached.)

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • If no issue exists and your change is not a small fix, please create an issue first.
• If this pull request adds new functionality, it includes unit tests that cover the changes
• If this pull request removes docs files, it includes redirect settings in mint.json.
• If this pull request adds functions or classes, it includes helpful docstrings.

[codspeed-hq]

CodSpeed Performance Report

Merging #16024 will not alter performance

_{Comparing remove-worker-logging-experiment (a3aa176) with main (377505b)}

Summary

✅ 3 untouched benchmarks

[zzstoatzz]

lgtm!

[cicdw]

🚀