feat: allow customization of passkey label

[fritterhoff]

fixes #9

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 94.27%. Comparing base (4168bd4) to head (affd2fe).
Report is 1 commits behind head on main.

Files	Patch %	Lines
edumfa/api/lib/policyhelper.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   94.27%   94.27%   -0.01%     
==========================================
  Files         175      175              
  Lines       23868    23876       +8     
==========================================
+ Hits        22501    22508       +7     
- Misses       1367     1368       +1     

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