PM-27867: feat: Use SDK for prelogin API

[david-livefront]

🎟️ Tracking

PM-27867

📔 Objective

This PR updates the login flow to use the SDK for the pre-login API instead of making the call ourselves.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.93%. Comparing base (b99ad92) to head (9effa1b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7357      +/-   ##
==========================================
- Coverage   85.94%   85.93%   -0.02%     
==========================================
  Files        1045      902     -143     
  Lines       68943    66475    -2468     
  Branches    10249    10171      -78     
==========================================
- Hits        59255    57126    -2129     
+ Misses       6077     5772     -305     
+ Partials     3611     3577      -34     

Flag	Coverage Δ
app-data	18.40% <100.00%> (-0.14%)	⬇️
app-ui-auth-tools	18.74% <0.00%> (-0.34%)	⬇️
app-ui-platform	16.30% <0.00%> (-0.54%)	⬇️
app-ui-vault	27.08% <0.00%> (-0.57%)	⬇️
authenticator	6.00% <0.00%> (+<0.01%)	⬆️
lib-core-network-bridge	4.00% <0.00%> (-0.04%)	⬇️
lib-data-ui	1.19% <0.00%> (+<0.01%)	⬆️

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