stats/opentelemetry: remove client retry attributes from server spans

[vinothkumarr227]

Fixes: #8430

RELEASE NOTES:

stats/opentelemetry: Removed client-specific retry attributes from server spans to align with tracing proposal A72.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.31%. Comparing base (4af0faa) to head (4f79357).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8466      +/-   ##
==========================================
+ Coverage   82.25%   82.31%   +0.06%     
==========================================
  Files         414      414              
  Lines       40434    40472      +38     
==========================================
+ Hits        33259    33315      +56     
+ Misses       5807     5789      -18     
  Partials     1368     1368              

Files with missing lines	Coverage Δ
stats/opentelemetry/trace.go	89.83% <100.00%> (+0.94%)	⬆️

... and 18 files with indirect coverage changes

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[vinothkumarr227]

This PR should be put on hold until #8342 is merged. We can review this PR after that.