helper script for fixing up repo size

[adeebshihadeh]

branch	old size	new size	notes
master	337MB	337MB	can rewrite the history
release2	100M	3MB	>20K files moved to LFS
release3	145M	145M	longer term project to move releases
devel	1.5G	120M	full history moved to commaai/openpilot-releases

plus 240M of LFS objects currently on master

total: 2.0G -> 674M (measured with a local mirror clone, GitHub still needs to run git gc on their end)

Some considerations:

• We should be careful with increasing our LFS usage after this to keep the repo small. git's partial clones seem like the way to go
  • LFS itself has been buggy for us in the past
  • the storage/bandwidth costs
  • forks can't really push to LFS without pushing to a new repo as if they weren't a fork
• commit hashes from the original history will be broken

TODOs

• fix big files still in master move remaining big files into LFS #30053
• test for big files pre-commit: always check all file sizes #30050
• move devel and release history to a new repo
• re-tag releases that were built on the public openpilot master?
• move release2 + dashcam to LFS. takes up 3M now

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