FLEXY-5363 Pass IsPlugin param from CLI to the Create Deployment API

[phollaa]

FLEXY-5636
This PR adds an optional IsPlugin: true parameter to the deployment API to prevent CLI asset deployment issues caused by the serverless v2 backdoor closure

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.60%. Comparing base (2d98145) to head (3a87794).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1052      +/-   ##
==========================================
- Coverage   90.66%   90.60%   -0.06%     
==========================================
  Files         146      146              
  Lines       14473    14473              
  Branches      982      981       -1     
==========================================
- Hits        13121    13112       -9     
- Misses       1352     1361       +9     

Flag	Coverage Δ
	90.60% <100.00%> (-0.06%)	⬇️

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