chore: IdentityAssertion struct now caches its fully-qualified JUMBF label when possible

[scouten-adobe]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.03%. Comparing base (6c41e4d) to head (e2bdfb2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1291      +/-   ##
==========================================
- Coverage   78.03%   78.03%   -0.01%     
==========================================
  Files         150      150              
  Lines       38328    38339      +11     
==========================================
+ Hits        29910    29918       +8     
- Misses       8418     8421       +3     

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