litGPU: run Pytorch tests with uv setup

[Borda]

What does this PR do?

The installation is much faster, so the cost is also lower
also we would be able to drop building GPU images for CI

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📚 Documentation preview 📚: https://pytorch-lightning--21158.org.readthedocs.build/en/21158/

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 pytorch_lightning: Tests workflow

Check ID	Status
pl-cpu-guardian	success	✅

These checks are required after the changes to tests/tests_pytorch/plugins/precision/test_fsdp.py.

🟢 pytorch_lightning: Azure GPU

Check ID	Status
pytorch-lightning (GPUs) (testing Lightning | latest)	success	✅
pytorch-lightning (GPUs) (testing PyTorch | oldest)	success	✅
pytorch-lightning (GPUs) (testing PyTorch | latest)	success	✅

These checks are required after the changes to tests/tests_pytorch/plugins/precision/test_fsdp.py.

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Thank you for your contribution! 💜

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79%. Comparing base (663b6ce) to head (42493af).
⚠️ Report is 10 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (663b6ce) and HEAD (42493af). Click for more details.

HEAD has 357 uploads less than BASE

Flag	BASE (663b6ce)	HEAD (42493af)
cpu	108	27
python	12	3
lightning_fabric	25	0
pytest	56	0
python3.12	12	3
python3.10	24	6
python3.12.7	36	9
lightning	61	15
python3.11	24	6
gpu	2	0
pytorch2.1	12	6
pytest-full	54	27
pytorch2.2.2	6	3
pytorch_lightning	24	12
pytorch2.7	6	3
pytorch2.8	6	3
pytorch2.3	6	3
pytorch2.5.1	6	3
pytorch2.4.1	6	3
pytorch2.6	6	3

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #21158     +/-   ##
=========================================
- Coverage      87%      79%     -8%     
=========================================
  Files         269      266      -3     
  Lines       23595    23601      +6     
=========================================
- Hits        20582    18606   -1976     
- Misses       3013     4995   +1982