litGPU: run Fabric 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 to drop building GPU images for CI

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📚 Documentation preview 📚: https://pytorch-lightning--21157.org.readthedocs.build/en/21157/

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 lightning_fabric: CPU workflow

Check ID	Status
fabric-cpu-guardian	success	✅

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

🟢 lightning_fabric: Azure GPU

Check ID	Status
lightning-fabric (GPUs) (testing Fabric | oldest)	success	✅
lightning-fabric (GPUs) (testing Fabric | latest)	success	✅
lightning-fabric (GPUs) (testing Lightning | latest)	success	✅

These checks are required after the changes to tests/tests_fabric/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 48%. Comparing base (92544c3) to head (bf2e4af).
⚠️ Report is 2 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (92544c3) and HEAD (bf2e4af). Click for more details.

HEAD has 139 uploads less than BASE

Flag	BASE (92544c3)	HEAD (bf2e4af)
pytest	29	28
lightning	31	15
cpu	53	25
python	6	3
python3.10	12	5
python3.11	12	5
python3.12.7	18	9
pytorch2.1	6	0
pytest-full	27	0
pytorch_lightning	12	0
pytorch2.7	3	0
python3.12	5	3
pytorch2.8	3	0
pytorch2.3	3	0
pytorch2.5.1	3	0
pytorch2.2.2	3	0
pytorch2.4.1	3	0
pytorch2.6	3	0

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #21157     +/-   ##
=========================================
- Coverage      87%      48%    -39%     
=========================================
  Files         269      266      -3     
  Lines       23656    23600     -56     
=========================================
- Hits        20636    11417   -9219     
- Misses       3020    12183   +9163