The initial implementation for this feature used the issue UUID
to create the topics, as some of the webhook events only provide
this and it is the only way to group sub-issues with parents.
However, if we sacrifice this and allow sub-issues to be
their own topic then we can avoid using the UUID as the topic name.
I think the quality of life improvement to topics here warrants this change,
as UUID topic names can be come unruly very quickly.
Part of #23118.
This is preparatory work towards adding a Topic model.
We plan to use the local variable name as 'topic' for
the Topic model objects.
Currently, we use *topic as the local variable name for
topic names.
We rename local variables of the form *topic to *topic_name
so that we don't need to think about type collisions in
individual code paths where we might want to talk about both
Topic objects and strings for the topic name.