This is a follow-up in response to Tim's comments on #9951.
In instances where all messages from a GitHub integration are
grouped under one user specified topic (specified in the URL), we
should include the title of the issue/PR in the message body, since
the availability of a user-specified topic precludes us from
including it in the topic itself (which was the default behaviour).
This was technically a bug. For events that aren't unsupported
intentionally, the control should fall to the line that raises
UnknownWebhookEventType, and shouldn't be handled by anything else.
The events that are intentionally unsupported should be handled
more explicitly.
For our Git integrations, we now only display the number of commits
pushed when the pusher also happens to be the only author of the
commits being pushed.
Part of #3968.
Follow-up to #4006.
For Git push messages, we now have a single space character between
the name of a commit's author and the number of commits by that
author, plus a period at the end.
Part of #3968.
Follow-up to #4006.
We now show a few new things:
(1) The number of commits pushed.
(2) Who authored the commits (just counts, not which specific ones, for brevity).
Add tests for case of multiple committers.
Part of #3968.