added stub script that prints out latest commits (#78397)
Fixes #76700
Prints out a list of commit SHAs from the last M minutes. Takes in a command line argument for the minutes, otherwise defaults to 60 mins.
**Test Plan**: compare output with the SHAs from the HUD and see if they are correct. Some SHAS printed with the script are not included on the HUD, but all of the commits on the HUD are outputted correctly.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/78397
Approved by: https://github.com/seemethere
