remove deprecated AttributeSetter function in otelaws

[mohitsethia]

fixes: #7100 deprecating AttributeSetter instead AttributeBuilder should be used.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.8%. Comparing base (e76d83c) to head (7f8396f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #7137     +/-   ##
=======================================
- Coverage   75.8%   75.8%   -0.1%     
=======================================
  Files        207     207             
  Lines      19402   19395      -7     
=======================================
- Hits       14726   14717      -9     
- Misses      4243    4245      +2     
  Partials     433     433             

Files with missing lines	Coverage Δ
...tation/github.com/aws/aws-sdk-go-v2/otelaws/aws.go	95.8% <ø> (ø)
...ion/github.com/aws/aws-sdk-go-v2/otelaws/config.go	100.0% <ø> (ø)

... and 1 file with indirect coverage changes

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