Make user localparts non-optional

[tlater-famedly]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 97.00855% with 7 lines in your changes missing coverage. Please review.

Project coverage is 93.16%. Comparing base (727c4d9) to head (7ddbd2a).
Report is 3 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/lib.rs	90.47%	2 Missing ⚠️
src/sources/csv.rs	88.23%	2 Missing ⚠️
src/zitadel.rs	97.75%	2 Missing ⚠️
src/user.rs	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #111      +/-   ##
==========================================
+ Coverage   92.86%   93.16%   +0.29%     
==========================================
  Files           9        9              
  Lines        1669     1771     +102     
==========================================
+ Hits         1550     1650     +100     
- Misses        119      121       +2     

Files with missing lines	Coverage Δ
src/bin/migrate.rs	99.02% <100.00%> (+0.19%)	⬆️
src/sources/ldap.rs	96.85% <100.00%> (+0.05%)	⬆️
src/user.rs	90.67% <87.50%> (-1.89%)	⬇️
src/lib.rs	86.33% <90.47%> (-0.80%)	⬇️
src/sources/csv.rs	94.84% <88.23%> (+0.05%)	⬆️
src/zitadel.rs	97.75% <97.75%> (+1.02%)	⬆️

... and 1 file with indirect coverage changes

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