Added autopatch to remove ponder vote data

Summary: Fixes T9117. Adds a migration to remove ponder vote data.

Test Plan: I added a bunch of lines to phabricator_user.edge with type 18 and they were successfully removed by this patch

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: epriestley, yelirekim

Maniphest Tasks: T9117

Differential Revision: https://secure.phabricator.com/D16452