R1:b32bfb654163

Render commit summaries when rendering handles

Summary:
Fixes T2563. Instead of rendering "rPnnnnnn", render "rPnnnnnn: add feature X". Tweak Audit tables to accommodate.

@vrana / @nh, this migration might take a while. You could safely skip it when deploying and then run it after deployment.

I think I fixed all the other places where these render, but might have missed something.

Test Plan:
- Ran first schema migration, clicked around to make sure nothing broke.
- Ran `scripts/repository/reparse.