[PR #7043/bee613d0 backport][3.11] Add clarification about GracefulExit when using handle_signals=True

[patchback]

This is a backport of PR #7043 as merged into master (bee613d).

What do these changes do?

Clarify that GracefulExit needs to be handled manually when using handle_signals=True in AppRunner and ServerRunner.

Are there changes in behavior for the user?

N/A

Related issue number

Fixes #4414

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> for example (588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the pr
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: "Fix issue with non-ascii contents in doctest text files."

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.77%. Comparing base (398eef2) to head (e213b5f).
Report is 4 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #9123   +/-   ##
=======================================
  Coverage   97.77%   97.77%           
=======================================
  Files         108      108           
  Lines       34578    34578           
  Branches     4108     4108           
=======================================
  Hits        33808    33808           
  Misses        575      575           
  Partials      195      195           

Flag	Coverage Δ
CI-GHA	97.67% <ø> (ø)
OS-Linux	97.35% <ø> (-0.01%)	⬇️
OS-Windows	94.92% <ø> (ø)
OS-macOS	97.04% <ø> (-0.01%)	⬇️
Py-3.10.11	97.13% <ø> (ø)
Py-3.10.14	97.06% <ø> (ø)
Py-3.11.9	97.29% <ø> (ø)
Py-3.12.5	97.39% <ø> (ø)
Py-3.9.13	97.03% <ø> (+<0.01%)	⬆️
Py-3.9.19	96.97% <ø> (ø)
Py-pypy7.3.16	96.57% <ø> (ø)
VM-macos	97.04% <ø> (-0.01%)	⬇️
VM-ubuntu	97.35% <ø> (-0.01%)	⬇️
VM-windows	94.92% <ø> (ø)

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