[PR #10910/36a2567 backport][3.11] Remove mocked coro from tests

[bdraco]

This is a partial backport of 36a2567, make_mocked_coro is still left in the test utils for backwards compat, and only the internal tests are updated.

(cherry picked from commit 36a2567)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.08%. Comparing base (bd77b3e) to head (12c2d8d).
Report is 1 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.11   #10912      +/-   ##
==========================================
+ Coverage   98.06%   98.08%   +0.01%     
==========================================
  Files         126      126              
  Lines       37745    37728      -17     
  Branches     4562     4566       +4     
==========================================
- Hits        37016    37006      -10     
+ Misses        548      544       -4     
+ Partials      181      178       -3     

Flag	Coverage Δ
CI-GHA	97.97% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.67% <97.36%> (+<0.01%)	⬆️
OS-Windows	94.68% <63.81%> (+0.32%)	⬆️
OS-macOS	96.80% <97.36%> (+0.08%)	⬆️
Py-3.10.11	96.67% <100.00%> (-0.03%)	⬇️
Py-3.10.17	97.18% <97.36%> (?)
Py-3.11.12	97.25% <97.36%> (+0.65%)	⬆️
Py-3.11.9	96.75% <100.00%> (?)
Py-3.12.10	97.75% <100.00%> (+0.26%)	⬆️
Py-3.13.3	97.68% <100.00%> (?)
Py-3.9.13	96.58% <100.00%> (+2.42%)	⬆️
Py-3.9.22	97.09% <97.36%> (-0.06%)	⬇️
Py-pypy7.3.16	96.66% <97.36%> (?)
VM-macos	96.80% <97.36%> (+0.08%)	⬆️
VM-ubuntu	97.67% <97.36%> (+<0.01%)	⬆️
VM-windows	94.68% <63.81%> (+0.32%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #10912 will not alter performance

_{Comparing patchback/backports/3.11/36a2567d96903007a2b6ff6c10af9392767bfe0f/pr-10910 (12c2d8d) with 3.11 (bd77b3e)}

Summary

✅ 56 untouched benchmarks