Revert #20825 & fix sigterm exception handling

[deependujha]

What does this PR do?

Fixes #<issue_number>
reverts commit #20825

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📚 Documentation preview 📚: https://pytorch-lightning--21666.org.readthedocs.build/en/21666/

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 pytorch_lightning: Tests workflow

Check ID	Status
pl-cpu-guardian	success	✅

🟢 pytorch_lightning: lit GPU

Check ID	Status
pytorch.yml / Lit Job (nvidia/cuda:12.1.1-devel-ubuntu22.04, pytorch, 3.10)	success	✅
pytorch.yml / Lit Job (lightning, 3.12)	success	✅
pytorch.yml / Lit Job (pytorch, 3.12)	success	✅

🟢 Benchmarks

Check ID	Status
benchmark.yml / Lit Job (fabric)	success	✅
benchmark.yml / Lit Job (pytorch)	success	✅

🟢 pytorch_lightning: Docs

Check ID	Status
docs-make (pytorch, doctest)	success	✅
docs-make (pytorch, html)	success	✅

🟢 mypy

Check ID	Status
mypy	success	✅

🟢 install

Check ID	Status
install-pkg-guardian	success	✅

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79%. Comparing base (efb7328) to head (b4794f7).
✅ All tests successful. No failed tests found.

❗ There is a different number of reports uploaded between BASE (efb7328) and HEAD (b4794f7). Click for more details.

HEAD has 2040 uploads less than BASE

Flag	BASE (efb7328)	HEAD (b4794f7)
cpu	500	42
python	36	3
lightning_fabric	160	0
pytest	250	0
python3.12	143	12
lightning	180	15
python3.11	72	6
python3.10	36	3
python3.13	105	9
python3.12.7	108	9
pytorch2.1	36	6
pytorch_lightning	160	27
pytest-full	250	42
pytorch2.7	18	3
pytorch2.10	35	6
pytorch2.8	35	6
pytorch2.2.2	18	3
pytorch2.3	18	3
pytorch2.5.1	18	3
pytorch2.9	36	6
pytorch2.4.1	18	3
pytorch2.6	18	3

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #21666     +/-   ##
=========================================
- Coverage      87%      79%     -8%     
=========================================
  Files         270      267      -3     
  Lines       23973    23895     -78     
=========================================
- Hits        20751    18797   -1954     
- Misses       3222     5098   +1876