Permanently destroy Almanac properties with the destruction engine
Summary: As suggested in D14461.
Test Plan: Used `./bin/remove destroy` on an Almanac service with properties attached, saw entries removed from the `phabricator_almanac.almanac_property` table.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D14490
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