chore(cawg_identity): Add test case with multiple manifests each with their own identity assertion

[scouten-adobe]

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.91%. Comparing base (dbb245b) to head (0fa01cd).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cawg_identity/src/identity_assertion/assertion.rs	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #923      +/-   ##
==========================================
+ Coverage   78.78%   78.91%   +0.13%     
==========================================
  Files         147      147              
  Lines       34805    34805              
==========================================
+ Hits        27420    27466      +46     
+ Misses       7385     7339      -46     

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