API: Ability to list commits in order (--topo-order)

What does this MR do?

GET /projects/:id/repository/commits supports a new optional attribute to list the commits in order.

At the moment the possible values are none (default) and topo witch implements (--topo-order).
https://git-scm.com/docs/git-log#Documentation/git-log.txt---topo-order

This was introduced in Gitaly v1.86.0 (!24610 (merged))

• https://gitlab.com/gitlab-org/gitaly/-/blob/master/CHANGELOG.md#v1860
• gitaly!1791 (merged)

I've tested this locally and it works as expected:

Closes #35671 (closed)