WebKitBot is bring moved to a new platform requiring going through proxy server to reach Slack's API. Environment name for Bugzilla credentials need to be in upper case since buzilla.py change environment name to upper case when reading them. The fall back was to look for credentials in .git/config but that is not what explained in the Readme file. Also, setting Logging to DEBUG for the Slack API's to ease troubleshooting Slack related issues.
<rdar://problem/107483623>
Committed 262685@main (b8c7f56ec505): <https://commits.webkit.org/262685@main> Reviewed commits have been landed. Closing PR #12256 and removing active labels.