Don't clobber the user's upstream settings (cherry-pick #26486) (#26528)
gcp-cherry-pick-bot[bot]
and
Mikayla Maki
created
Cherry-picked Don't clobber the user's upstream settings (#26486)
It's not clobbering time :(
Release Notes:
- Git Beta: Fixed a bug where our push button would always overwrite the
current branch's upstream
Co-authored-by: Mikayla Maki <mikayla@zed.dev>