Convert to custom encoding for diffusion blame views
Summary:
If a repository is configured with a custom encoding, it wasn't respected by DiffusionGitFileContentQuery making all views with
non-UTF8 characters fail. Check if we have a custom encoding and encode if any it set.
NOTE: This only works for Git repositories.
Test Plan: Browsed a repository with custom encoding before and after this patch.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T452
Differential Revision: https://secure.phabricator.com/D3251