Fix synonym count issues on debug

[cheenamalhotra]

Addresses #3016 due to deprecated keywords count mismatch..
This change is more effective for unit testing than #3088, hence proposing the same.

The deprecated keywords weren't tracked before, and this PR removes the counter. If keywords are needed to be deprecated, we can deprecate them on docs and follow deprecation path in future releases. We need not manage counters to be modified as they are very sensitive to changes and affect unit testing in debug mode.

[cheenamalhotra]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.76%. Comparing base (7d93424) to head (ee34563).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3098      +/-   ##
==========================================
- Coverage   72.76%   72.76%   -0.01%     
==========================================
  Files         283      283              
  Lines       58968    58996      +28     
==========================================
+ Hits        42908    42926      +18     
- Misses      16060    16070      +10     

Flag	Coverage Δ
addons	92.58% <ø> (ø)
netcore	75.51% <100.00%> (+0.02%)	⬆️
netfx	71.22% <100.00%> (-0.02%)	⬇️

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