Enable workhorse_use_sidechannel by default
What does this MR do and why?
This changes two things:
- Use sidechannel conections between Workhorse and Gitaly
- Update developer documentation to reflect that we no longer need or use CI_PRE_CLONE_SCRIPT for gitlab-org/gitlab
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.