add logic to handle substitutions

[kddejong]

Issue #, if available:
fix #3724
Description of changes:

• add logic to handle substitutions

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[codecov]

Codecov Report

Attention: Patch coverage is 93.10345% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.76%. Comparing base (8e463fb) to head (b786784).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../resources/stepfunctions/StateMachineDefinition.py	93.10%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3768      +/-   ##
==========================================
- Coverage   93.77%   93.76%   -0.01%     
==========================================
  Files         362      362              
  Lines       12356    12371      +15     
  Branches     2521     2527       +6     
==========================================
+ Hits        11587    11600      +13     
  Misses        429      429              
- Partials      340      342       +2     

Flag	Coverage Δ
unittests	93.72% <93.10%> (-0.01%)	⬇️

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