fix: Remove RefreshBootstrap and refresh token handling

[mofojed]

• This never worked and doesn't get used anyway, since we attempt re-login with the pre-shared key if provided
• Tested by logging into a server with a pre-shared key, then hitting Refresh and ensuring it logged in again without being prompted

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.61%. Comparing base (229adf0) to head (4560be7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2257      +/-   ##
==========================================
+ Coverage   46.57%   46.61%   +0.04%     
==========================================
  Files         698      696       -2     
  Lines       38767    38731      -36     
  Branches     9866     9802      -64     
==========================================
  Hits        18054    18054              
+ Misses      20702    20623      -79     
- Partials       11       54      +43     

Flag	Coverage Δ
unit	46.61% <ø> (+0.04%)	⬆️

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