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 search index.

Test Plan:

• Ran arc unit --everything, got clean results.
• Cost to do a storage upgrade on an empty namespace dropped from ~4s to ~3s.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D11454