test: migrated to swift-testing

[soumyamahunt]

resolves #98

[codecov]

Codecov Report

Attention: Patch coverage is 88.40580% with 8 lines in your changes missing coverage. Please review.

Project coverage is 94.94%. Comparing base (b929e06) to head (246b0ad).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...rces/PluginCore/Variables/Type/ActorVariable.swift	78.37%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
- Coverage   95.04%   94.94%   -0.10%     
==========================================
  Files         109      109              
  Lines        3896     3940      +44     
==========================================
+ Hits         3703     3741      +38     
- Misses        193      199       +6     

Flag	Coverage Δ
	94.94% <88.40%> (-0.10%)	⬇️

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