gitaly_client: Stop checking deprecated git error in UserSquash
What does this MR do and why?
Gitaly has migrated UserSquash to use structured errors instead of
returning errors via a valid response. This new calling convention was
unconditionally enabled upstream via e8413304d (operations: Always use
structured errors for UserSquash, 2022-03-21), which means that the
git_error
response field is never set anymore.
Stop checking for presence of this field so that Gitaly can finally remove it altogether.
MR acceptance checklist
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