Summary: Allow `PhrictionDocument` to be permanently deleted with `./bin/remove destroy`. Test Plan: Deleted a Phriction document with `./bin/remove` and verified that the database was in the expected state. ``` > ./bin/remove destroy PHID-WIKI-auj57rauigvcqvv5feh6 IMPORTANT: OBJECTS WILL BE PERMANENTLY DESTROYED! There is no way to undo this operation or ever retrieve this data. These 1 object(s) will be completely destroyed forever: - PHID-WIKI-auj57rauigvcqvv5feh6 (PhrictionDocument) Are you absolutely certain you want to destroy these 1 object(s)? [y/N] y Destroying objects... Destroying PhrictionDocument PHID-WIKI-auj57rauigvcqvv5feh6... Permanently destroyed 1 object(s). ``` Reviewers: #blessed_reviewers, epriestley Reviewed By: #blessed_reviewers, epriestley Subscribers: epriestley, Korvin Differential Revision: https://secure.phabricator.com/D9976