[PR #7168/8a525d98 backport][3.11] Fix test_utils.make_mocked_request behaviour for empty payload

[patchback]

This is a backport of PR #7168 as merged into master (8a525d9).

What do these changes do?

Fixes #7167

In case of empty payload when initialized, it now assigns the payload as EMPTY_RESPONSE instance of EmptyStreamReader available via aiohttp/streams.py

Are there changes in behavior for the user?

No

Related issue number

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 97.73%. Comparing base (b73a4c1) to head (2ed6c25).
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    #8970   +/-   ##
=======================================
  Coverage   97.73%   97.73%           
=======================================
  Files         108      108           
  Lines       34367    34369    +2     
  Branches     4080     4079    -1     
=======================================
+ Hits        33590    33592    +2     
  Misses        581      581           
  Partials      196      196           

Flag	Coverage Δ
CI-GHA	97.63% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.32% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.87% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.00% <100.00%> (-0.01%)	⬇️
Py-3.10.11	97.09% <100.00%> (+<0.01%)	⬆️
Py-3.10.14	97.02% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.25% <100.00%> (+<0.01%)	⬆️
Py-3.12.5	97.35% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.99% <100.00%> (+<0.01%)	⬆️
Py-3.9.19	96.93% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.52% <100.00%> (-0.01%)	⬇️
VM-macos	97.00% <100.00%> (-0.01%)	⬇️
VM-ubuntu	97.32% <100.00%> (+<0.01%)	⬆️
VM-windows	94.87% <100.00%> (+<0.01%)	⬆️

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