Allow Fn::Transform inside a Fn::Sub

[kddejong]

Issue #, if available:
#3210

Description of changes:

• Allow Fn::Transform inside a Fn::Sub

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.95%. Comparing base (f8b97dc) to head (b7b5b08).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3213   +/-   ##
=======================================
  Coverage   91.95%   91.95%           
=======================================
  Files         300      300           
  Lines       10948    10948           
  Branches     2379     2379           
=======================================
  Hits        10067    10067           
  Misses        524      524           
  Partials      357      357           

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