Improve connection reuse test coverage

[bdraco]

I'm planning on removing .release() from the examples and the digest middleware. I wanted to make sure everything is working correctly before I proceed with that.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.77%. Comparing base (3c88f81) to head (08c29c2).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10949   +/-   ##
=======================================
  Coverage   98.77%   98.77%           
=======================================
  Files         129      129           
  Lines       39478    39539   +61     
  Branches     2186     2186           
=======================================
+ Hits        38993    39054   +61     
  Misses        337      337           
  Partials      148      148           

Flag	Coverage Δ
CI-GHA	98.65% <100.00%> (+<0.01%)	⬆️
OS-Linux	98.36% <100.00%> (+<0.01%)	⬆️
OS-Windows	96.54% <100.00%> (+0.01%)	⬆️
OS-macOS	97.51% <100.00%> (-0.01%)	⬇️
Py-3.10.11	97.41% <100.00%> (+<0.01%)	⬆️
Py-3.10.17	97.94% <100.00%> (+<0.01%)	⬆️
Py-3.11.12	98.02% <100.00%> (+0.01%)	⬆️
Py-3.11.9	97.48% <100.00%> (+<0.01%)	⬆️
Py-3.12.10	98.42% <100.00%> (+<0.01%)	⬆️
Py-3.13.3	98.41% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	97.29% <100.00%> (+<0.01%)	⬆️
Py-3.9.22	97.80% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.16	93.15% <100.00%> (-4.23%)	⬇️
VM-macos	97.51% <100.00%> (-0.01%)	⬇️
VM-ubuntu	98.36% <100.00%> (+<0.01%)	⬆️
VM-windows	96.54% <100.00%> (+0.01%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #10949 will not alter performance

_{Comparing connection_reuse_tests (08c29c2) with master (3c88f81)}

Summary

✅ 59 untouched benchmarks

[patchback]

Backport to 3.12: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply 06e3b36 on top of patchback/backports/3.12/06e3b3682c72ffa56b48087cf9b05b3f71f95ab1/pr-10949

Backporting merged PR #10949 into master

1. Ensure you have a local repo clone of your fork. Unless you cloned it
   from the upstream, this would be your origin remote.
2. Make sure you have an upstream repo added as a remote too. In these
   instructions you'll refer to it by the name upstream. If you don't
   have it, here's how you can add it:

   $ git remote add upstream https://github.com/aio-libs/aiohttp.git

3. Ensure you have the latest copy of upstream and prepare a branch
   that will hold the backported code:

   $ git fetch upstream
   $ git checkout -b patchback/backports/3.12/06e3b3682c72ffa56b48087cf9b05b3f71f95ab1/pr-10949 upstream/3.12

4. Now, cherry-pick PR Improve connection reuse test coverage #10949 contents into that branch:

   $ git cherry-pick -x 06e3b3682c72ffa56b48087cf9b05b3f71f95ab1

   If it'll yell at you with something like fatal: Commit 06e3b3682c72ffa56b48087cf9b05b3f71f95ab1 is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x 06e3b3682c72ffa56b48087cf9b05b3f71f95ab1

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR Improve connection reuse test coverage #10949 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/3.12/06e3b3682c72ffa56b48087cf9b05b3f71f95ab1/pr-10949

7. Create a PR, ensure that the CI is green. If it's not — update it so that
   the tests and any other checks pass. This is it!
   Now relax and wait for the maintainers to process your pull request
   when they have some cycles to do reviews. Don't worry — they'll tell you if
   any improvements are necessary when the time comes!

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