Remove outdated num_workers warnings

[awaelchli]

What does this PR do?

Follow up to #18591

TODO: Provide examples and numbers showing the warnings don't apply anymore.
TODO: Remove it from docs: https://lightning.ai/docs/pytorch/stable/advanced/speed.html#persistent-workers

---

📚 Documentation preview 📚: https://pytorch-lightning--18610.org.readthedocs.build/en/18610/

[github-actions]

⛈️ Required checks status: Has failure 🔴

Warning
This job will need to be re-run to merge your PR. If you do not have write access to the repository, you can ask Lightning-AI/lai-frameworks to re-run it. If you push a new commit, all of CI will re-trigger.

Groups summary

🔴 pytorch_lightning: Tests workflow

Check ID	Status
pl-cpu (macOS-11, lightning, 3.8, 1.11)	failure	❌
pl-cpu (macOS-11, lightning, 3.9, 1.12)	failure	❌
pl-cpu (macOS-11, lightning, 3.10, 1.13)	failure	❌
pl-cpu (macOS-11, lightning, 3.10, 2.0)	failure	❌
pl-cpu (macOS-11, lightning, 3.8, 1.11, oldest)	failure	❌
pl-cpu (ubuntu-20.04, lightning, 3.8, 1.11)	failure	❌
pl-cpu (ubuntu-20.04, lightning, 3.9, 1.12)	failure	❌
pl-cpu (ubuntu-20.04, lightning, 3.10, 1.13)	failure	❌
pl-cpu (ubuntu-20.04, lightning, 3.10, 2.0)	failure	❌
pl-cpu (ubuntu-20.04, lightning, 3.8, 1.11, oldest)	failure	❌
pl-cpu (windows-2022, lightning, 3.8, 1.11)	failure	❌
pl-cpu (windows-2022, lightning, 3.9, 1.12)	failure	❌
pl-cpu (windows-2022, lightning, 3.10, 1.13)	failure	❌
pl-cpu (windows-2022, lightning, 3.10, 2.0)	failure	❌
pl-cpu (windows-2022, lightning, 3.8, 1.11, oldest)	failure	❌
pl-cpu (macOS-11, pytorch, 3.8, 1.13)	failure	❌
pl-cpu (ubuntu-20.04, pytorch, 3.8, 1.13)	failure	❌
pl-cpu (windows-2022, pytorch, 3.8, 1.13)	failure	❌
pl-cpu (macOS-12, pytorch, 3.11, 2.0)	failure	❌
pl-cpu (ubuntu-22.04, pytorch, 3.11, 2.0)	failure	❌
pl-cpu (windows-2022, pytorch, 3.11, 2.0)	failure	❌

These checks are required after the changes to src/lightning/pytorch/trainer/connectors/data_connector.py, tests/tests_pytorch/trainer/connectors/test_data_connector.py.

🟢 pytorch_lightning: Azure GPU

Check ID	Status
[pytorch-lightning (GPUs) (testing Lightning	latest)](https://dev.azure.com/Lightning-AI/72ab7ed8-b00f-4b6e-b131-3388f7ffafa7/_build/results?buildId=175480&view=logs&jobId=47e66f3c-897a-5428-da11-bf5c7745762e)	success
[pytorch-lightning (GPUs) (testing PyTorch	latest)](https://dev.azure.com/Lightning-AI/72ab7ed8-b00f-4b6e-b131-3388f7ffafa7/_build/results?buildId=175480&view=logs&jobId=3f274fac-2e11-54ca-487e-194c91f3ae9f)	success

These checks are required after the changes to src/lightning/pytorch/trainer/connectors/data_connector.py, tests/tests_pytorch/trainer/connectors/test_data_connector.py.

🟢 pytorch_lightning: Benchmarks

Check ID	Status
lightning.Benchmarks	success	✅

These checks are required after the changes to src/lightning/pytorch/trainer/connectors/data_connector.py.

🟢 pytorch_lightning: Docs

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

These checks are required after the changes to src/lightning/pytorch/trainer/connectors/data_connector.py.

🟢 mypy

Check ID	Status
mypy	success	✅

These checks are required after the changes to src/lightning/pytorch/trainer/connectors/data_connector.py.

🟢 install

Check ID	Status
install-pkg (ubuntu-22.04, app, 3.8)	success	✅
install-pkg (ubuntu-22.04, app, 3.11)	success	✅
install-pkg (ubuntu-22.04, fabric, 3.8)	success	✅
install-pkg (ubuntu-22.04, fabric, 3.11)	success	✅
install-pkg (ubuntu-22.04, pytorch, 3.8)	success	✅
install-pkg (ubuntu-22.04, pytorch, 3.11)	success	✅
install-pkg (ubuntu-22.04, lightning, 3.8)	success	✅
install-pkg (ubuntu-22.04, lightning, 3.11)	success	✅
install-pkg (ubuntu-22.04, notset, 3.8)	success	✅
install-pkg (ubuntu-22.04, notset, 3.11)	success	✅
install-pkg (macOS-12, app, 3.8)	success	✅
install-pkg (macOS-12, app, 3.11)	success	✅
install-pkg (macOS-12, fabric, 3.8)	success	✅
install-pkg (macOS-12, fabric, 3.11)	success	✅
install-pkg (macOS-12, pytorch, 3.8)	success	✅
install-pkg (macOS-12, pytorch, 3.11)	success	✅
install-pkg (macOS-12, lightning, 3.8)	success	✅
install-pkg (macOS-12, lightning, 3.11)	success	✅
install-pkg (macOS-12, notset, 3.8)	success	✅
install-pkg (macOS-12, notset, 3.11)	success	✅
install-pkg (windows-2022, app, 3.8)	success	✅
install-pkg (windows-2022, app, 3.11)	success	✅
install-pkg (windows-2022, fabric, 3.8)	success	✅
install-pkg (windows-2022, fabric, 3.11)	success	✅
install-pkg (windows-2022, pytorch, 3.8)	success	✅
install-pkg (windows-2022, pytorch, 3.11)	success	✅
install-pkg (windows-2022, lightning, 3.8)	success	✅
install-pkg (windows-2022, lightning, 3.11)	success	✅
install-pkg (windows-2022, notset, 3.8)	success	✅
install-pkg (windows-2022, notset, 3.11)	success	✅

These checks are required after the changes to src/lightning/pytorch/trainer/connectors/data_connector.py.

---

Thank you for your contribution! 💜

Note
This comment is automatically generated and updates for 60 minutes every 180 seconds. If you have any other questions, contact carmocca for help.