Summary: Ref T10010. Fixes T10107. When we publish a transaction about a project, we perform visibility checks for many different users. We need to know all of the ancestors' members to perform these checks. Test Plan: - Before patch: when updating a subproject, daemons fatal trying to publish things because they can not test visibility of parent projects. - After patch: daemons successfully publish subproject updates. - Also added a unit test. Reviewers: chad Reviewed By: chad Maniphest Tasks: T10010, T10107 Differential Revision: https://secure.phabricator.com/D15054