Generate expected Ponder schemata

Summary:
Ref T1191.

  - Removes ponder comment table. This was migrated a very long time ago.

Test Plan:
  - Grepped for removed table.
  - Saw ~100 fewer issues in web UI.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T1191

Differential Revision: https://secure.phabricator.com/D10582