[snapshot] Fix checkout fetch depth to update the latest-snapshot branch (#6945)
[snapshot] Fix checkout fetch depth to update the latest-snapshot branch (#6945)

* [snapshot] Fix checkout fetch depth to update the latest-snapshot branch

Fix https://github.com/google/iree/runs/3491586526?check_suite_focus=true
Use fetch-depth: 0 to get the full history instead.
Also update the remote branch name.
iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree,google/iree,google/iree,google/iree,google/iree,iree-org/iree,google/iree,google/iree,iree-org/iree,iree-org/iree,google/iree