Users of project mirrors would see that the number of branches did not
match the number in the branch dropdown because remote branches were
counted when Rugged was in use. With Gitaly, only local branches
are counted.

Closes #36934

An upcoming update to rubocop-gitlab-security added additional
violations.

This helps keep the abstraction layers simpler, and also keep the
interface of those methods consistent, in case of implementation
changes.

Closes gitaly#437

The raw_log method is meant to become the Gitaly RPC boundary. By
setting the defaults before doing the RPC we keep the RPC
implementation simpler. We also sidestep the unfortunate subtleties of
what happens when options[:limit] is not set, or nil.

Closes gitaly#433

Closes gitaly#421

Closes gitaly#415