Migrate Workhorse Send{Diff,Patch} to Gitaly

~Conversation: https://gitlab.com/gitlab-org/gitaly/issues/528 and https://gitlab.com/gitlab-org/gitaly/issues/529

Related to https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/200

What does this MR do?

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Edited by username-removed-506061