Improve ref resolution for Git branches and tags
Summary:
Fixes T7982.
- When resolving branches, make sure they get type 'branch'.
- Correctly resolve refs when a repository has a branch and tag with the same name.
Test Plan: Disabled ref cache and resolved refs in a Git repository with a 'master' tag and a 'master' branch. Saw refs resolve accurately.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T7982
Differential Revision: https://secure.phabricator.com/D12609