Update GetAtt logic for SC Cfn type

[kddejong]

Issue #, if available:
fix #3474

Description of changes:

• Update GetAtt logic for SC Cfn type

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.31%. Comparing base (78e9fa9) to head (594a4aa).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3475      +/-   ##
==========================================
- Coverage   93.31%   93.31%   -0.01%     
==========================================
  Files         325      325              
  Lines       11075    11081       +6     
  Branches     2320     2323       +3     
==========================================
+ Hits        10335    10340       +5     
  Misses        415      415              
- Partials      325      326       +1     

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