R1:614f911217cf

Regenerate Quickstart SQL

Summary:
One advantage I wanted to get out of T1191 is automated rebuilds of `quickstart.sql`. If they don't actually work, I'd like to know sooner rather than later. We haven't rebuilt in a couple months, so give it a shot.

Ran into two issues:

- Some very old patches specify overlong keys which don't work if your default charsets are utf8mb4. Shorten these. No real users have applied these in a very long time.
- Some gymnastics around `corpus` for the new Conpherence…