fix: use standalone tests' exit code

[Borda]

What does this PR do?

increase stability and lower false negative rate

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📚 Documentation preview 📚: https://pytorch-lightning--20430.org.readthedocs.build/en/20430/

cc @Borda

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 pytorch_lightning: Tests workflow

Check ID	Status
pl-cpu (macOS-14, lightning, 3.9, 2.1, oldest)	success	✅
pl-cpu (macOS-14, lightning, 3.10, 2.1)	success	✅
pl-cpu (macOS-14, lightning, 3.11, 2.2.2)	success	✅
pl-cpu (macOS-14, lightning, 3.11, 2.3)	success	✅
pl-cpu (macOS-14, lightning, 3.12, 2.4.1)	success	✅
pl-cpu (macOS-14, lightning, 3.12, 2.5.1)	success	✅
pl-cpu (ubuntu-20.04, lightning, 3.9, 2.1, oldest)	success	✅
pl-cpu (ubuntu-20.04, lightning, 3.10, 2.1)	success	✅
pl-cpu (ubuntu-20.04, lightning, 3.11, 2.2.2)	success	✅
pl-cpu (ubuntu-20.04, lightning, 3.11, 2.3)	success	✅
pl-cpu (ubuntu-22.04, lightning, 3.12, 2.4.1)	success	✅
pl-cpu (ubuntu-22.04, lightning, 3.12, 2.5.1)	success	✅
pl-cpu (windows-2022, lightning, 3.9, 2.1, oldest)	success	✅
pl-cpu (windows-2022, lightning, 3.10, 2.1)	success	✅
pl-cpu (windows-2022, lightning, 3.11, 2.2.2)	success	✅
pl-cpu (windows-2022, lightning, 3.11, 2.3)	success	✅
pl-cpu (windows-2022, lightning, 3.12, 2.4.1)	success	✅
pl-cpu (windows-2022, lightning, 3.12, 2.5.1)	success	✅
pl-cpu (macOS-14, pytorch, 3.9, 2.1)	success	✅
pl-cpu (ubuntu-20.04, pytorch, 3.9, 2.1)	success	✅
pl-cpu (windows-2022, pytorch, 3.9, 2.1)	success	✅
pl-cpu (macOS-14, pytorch, 3.12, 2.5.1)	success	✅
pl-cpu (ubuntu-22.04, pytorch, 3.12, 2.5.1)	success	✅
pl-cpu (windows-2022, pytorch, 3.12, 2.5.1)	success	✅

These checks are required after the changes to tests/tests_pytorch/run_standalone_tasks.sh.

🟢 pytorch_lightning: Azure GPU

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

These checks are required after the changes to .azure/gpu-tests-pytorch.yml, tests/tests_pytorch/run_standalone_tasks.sh, tests/run_standalone_tests.sh.

🟢 lightning_fabric: Azure GPU

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

These checks are required after the changes to .azure/gpu-tests-fabric.yml, tests/run_standalone_tests.sh.

---

Thank you for your contribution! 💜

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[lantiga]

Looks good 🤞

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83%. Comparing base (173cb8c) to head (a9c0f9c).
Report is 56 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #20430    +/-   ##
========================================
- Coverage      87%      83%    -4%     
========================================
  Files         267      267            
  Lines       23203    23203            
========================================
- Hits        20190    19237   -953     
- Misses       3013     3966   +953     

[t-vi]

Supergood, this should get the most flaky bit of the CI under control! Thank you @Borda