[PR #8694/d83804db backport][3.10] Add cleanup_ctx example for sharing resources across subapps

[patchback]

This is a backport of PR #8694 as merged into master (d83804d).

Fixes #3876.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.69%. Comparing base (91c9c6f) to head (58256a2).

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #8695   +/-   ##
=======================================
  Coverage   97.69%   97.69%           
=======================================
  Files         108      108           
  Lines       34075    34075           
  Branches     4055     4055           
=======================================
  Hits        33288    33288           
  Misses        587      587           
  Partials      200      200           

Flag	Coverage Δ
CI-GHA	97.59% <ø> (ø)
OS-Linux	97.27% <ø> (ø)
OS-Windows	94.79% <ø> (ø)
OS-macOS	96.93% <ø> (+<0.01%)	⬆️
Py-3.10.11	97.03% <ø> (ø)
Py-3.10.14	97.03% <ø> (+0.04%)	⬆️
Py-3.11.9	97.22% <ø> (ø)
Py-3.12.4	97.31% <ø> (ø)
Py-3.8.10	94.40% <ø> (ø)
Py-3.8.18	96.76% <ø> (ø)
Py-3.9.13	96.91% <ø> (ø)
Py-3.9.19	96.86% <ø> (ø)
Py-pypy7.3.16	96.46% <ø> (+<0.01%)	⬆️
VM-macos	96.93% <ø> (+<0.01%)	⬆️
VM-ubuntu	97.27% <ø> (ø)
VM-windows	94.79% <ø> (ø)

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