Use io.Copy in gitaly smarthttp

This uses a new helper from gitaly-proto/go/helper. It lets us use more io functions.

assigned to @nick.thomas

assigned to @jacobvosmaer-gitlab

You could think of https://gitlab.com/gitlab-org/gitlab-workhorse/blob/bc3404336ce30c8bd2001a06bd63d3685dc15eb1/internal/gitaly/smarthttp.go#L124-144 as a similar to io.Copy. This MR replaces that code with an actual call to io.Copy.

assigned to @nick.thomas

added 2 commits

• a3be5472 - Use gitaly-proto 0.5.1
• 4c91b2db - Use io.Copy in gitaly smarthttp

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mentioned in commit 3a215f2e