pygit: force release of odb contexts after checkout/merge

[pmrowla]

• ❗ I have followed the Contributing to DVC checklist.

• 📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.

Thank you for the contribution - we'll try to review it as soon as possible. 🙏

Will close #5641

[pmrowla]

@werthen @FredericoCoelhoNunes can you try installing from this PR to see if it resolves your issue w/dvc exp run --temp or --queue+--run-all on NFS mounts

It can be installed via pip with:

pip install git+https://github.com/iterative/dvc.git@refs/pull/5849/head

[FredericoCoelhoNunes]

Hi @pmrowla , it did indeed seem to fix the problem for me! Fantastic work.
dvc exp show fails with ERROR: unexpected error - 'NoneType' object is not subscriptable immediately afterwards dvc exp run --run-all, but I think that's addressed here: #3434 (doesn't appear to be related with the issue at hand, but I thought it would be worth mentioning just in case).

[werthen]

I will also test this tomorrow, have had little time to do so.

[efiop]

@pmrowla What's the status on this one?

[pmrowla]

@pmrowla What's the status on this one?

@efiop

Was waiting on @werthen's test since they filed the original review, but given that we've had several other people confirm the fix works in discord I think we can merge this

[werthen]

For what it's worth, I also performed a test and it seems to be working as intended now. Thanks!