Remove special handling for virtual accounts

[matiasbzurovski]

Changelog

When implementing the delete account feature, we need to add in #268 special handling for 2 methods (fetch_all_account_resource_preferences & fetch_all_account_authorized_depositors) since their respective endpoints would return a 404 for virtual accounts.

This was fixed by the Gateway team, so such handling is no longer necessary. This integration test confirms it still works fine after the changes 🙂

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.3%. Comparing base (723d183) to head (fe1132e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #301   +/-   ##
=====================================
  Coverage   93.2%   93.3%           
=====================================
  Files       1095    1095           
  Lines      22930   22922    -8     
  Branches      77      77           
=====================================
- Hits       21389   21387    -2     
+ Misses      1527    1521    -6     
  Partials      14      14           

Flag	Coverage Δ
kotlin	97.9% <ø> (ø)
rust	92.7% <100.0%> (+<0.1%)	⬆️
swift	94.9% <ø> (ø)

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Files with missing lines	Coverage Δ
...es/sargon/src/gateway_api/methods/state_methods.rs	81.0% <100.0%> (+2.2%)	⬆️
...s/sargon/src/system/sargon_os/sargon_os_signing.rs	64.8% <ø> (ø)