BLM-2: Adding unit tests to chord clone

[Nusnus]

Added unit tests to chord cloning to test kwargs cloning.

[codecov]

Codecov Report

Merging #7668 (8931cda) into master (185d378) will increase coverage by 0.45%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7668      +/-   ##
==========================================
+ Coverage   89.29%   89.75%   +0.45%     
==========================================
  Files         138      138              
  Lines       16781    16996     +215     
  Branches     2451     2508      +57     
==========================================
+ Hits        14985    15255     +270     
+ Misses       1564     1491      -73     
- Partials      232      250      +18     

Flag	Coverage Δ
unittests	89.74% <ø> (+0.45%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
celery/fixups/django.py	88.57% <0.00%> (-5.46%)	⬇️
celery/backends/asynchronous.py	65.36% <0.00%> (-1.74%)	⬇️
celery/backends/couchbase.py	81.15% <0.00%> (-1.66%)	⬇️
celery/worker/consumer/consumer.py	93.93% <0.00%> (-0.87%)	⬇️
celery/worker/request.py	96.06% <0.00%> (-0.63%)	⬇️
celery/canvas.py	94.33% <0.00%> (-0.62%)	⬇️
celery/utils/imports.py	89.77% <0.00%> (-0.12%)	⬇️
celery/backends/base.py	92.93% <0.00%> (-0.07%)	⬇️
celery/result.py	96.29% <0.00%> (-0.06%)	⬇️
celery/beat.py	91.54% <0.00%> (-0.05%)	⬇️
... and 25 more

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[auvipy]

can you please check the lint errors

Lint error fixed