cli: move some git utilities to new crate::git_utils
#2855
Merged
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Gerrit also needs to be able to push low-level refs into upstream remotes, just like
jj git push
does. Doing so requires providing callbacks e.g. for various password entry mechanisms, which was private to thegit
command module.Pull these out to a new module
git_utils
so we can reuse it across the two call sites.This also moves a few other strictly Git-related functions into
git_utils
as well, just for the sake of consistency.Note: This was cut out of #2845 to keep the review smaller and also because it's largely procedural and simple.