Add an edge table to the search database
There aren't going to be any attached files, but there's also no edge table, so we fail.
We could skip this code, but we'll likely need an edge table here sooner or later so it's probably simpler in the long run to just add an empty one.
- Ran bin/storage upgrade, got a clean bill of health.
- Saved a form configuration after making a policy edit, no more edge exception.
Reviewed By: chad
Maniphest Tasks: T10778
Differential Revision: https://secure.phabricator.com/D15803