Update cache during login IFF relevant settings change

[synfinatic]

Port change from v2 branch

Refs: #555

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.86%. Comparing base (d0eb93c) to head (94dd91e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #941      +/-   ##
==========================================
+ Coverage   83.81%   83.86%   +0.05%     
==========================================
  Files          41       41              
  Lines        2989     3005      +16     
==========================================
+ Hits         2505     2520      +15     
- Misses        391      392       +1     
  Partials       93       93              

Flag	Coverage Δ
unittests	83.86% <93.75%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
sso/config.go	93.69% <100.00%> (+0.76%)	⬆️
sso/cache.go	54.57% <75.00%> (+0.24%)	⬆️

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