python3{11,12}Packages.nose: drop

🎉

This package has been deprecated and unmaintained upstream for almost a
decade, has required extensive patching to keep working on new Python
versions, will inevitably break again with Python 3.13 dropping 2to3,
is lacking a maintainer in Nixpkgs, is now unused in the tree, and
has caused us all far too many headaches lately. Let’s put an end
to this!

Shout‐outs to mweinelt and jchv for dealing with this situation
early on, pyrox0, Sigmanificient, and dotlambda for tackling a bunch
of packages, and natsukium for help with reviews. I never thought this
would get finished so quickly. We’ve collectively handled almost
1½ packages per day in the three months since I first opened the
tracking issue, and sometimes helped move the entire ecosystem forward.

Closes: #326513