Use CommitDiffRequest.MaxPatchBytes instead of hardcoded limit for single diff patches
With !858 (merged) we've hardcoded the 'single diff file' byte limitation, which was previously handled on GitLab side in a SIZE_LIMIT
constant.
Turns out we need to be able to send this value from GitLab in order to fix https://gitlab.com/gitlab-org/gitlab-ce/issues/50635 and work on https://gitlab.com/gitlab-org/gitlab-ce/issues/48027.
Proto MR: gitaly-proto!223 (merged)
Edited by GitLab Release Tools Bot