After recent refactorings status images popup started to fetch branches
info whenever a repo page was opened, resulting in additional HTTP
requests. Furthermore, because of a way we load branches, it could
result in builds view displaying very old builds, because in API V2 we
essentially download last build for each branch for branches request.
This commit fixes the situation in 2 ways:
1. We wait with downloading branhes till the popup is open
2. We use a V3 requests to download branches and we don't put that data
into the store
