Summary: Fixes T11276. This feels slightly iffy (we `attachRepository()` here, and also when applying the TYPE_REPOSITORY transaction) but simpler than trying to reorder things. Test Plan: Created a repository URI with transactions in `["uri", "repository"]` order. Reviewers: chad, avivey Reviewed By: avivey Maniphest Tasks: T11276 Differential Revision: https://secure.phabricator.com/D16237