test: Remove clearTestState in FileManagerTests

[philipphofmann]

The tests also succeed without clearTestState, so we can remove the extra work.

#skip-changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.412%. Comparing base (9f12001) to head (df3eb69).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4220       +/-   ##
=============================================
+ Coverage   91.406%   91.412%   +0.005%     
=============================================
  Files          611       611               
  Lines        49062     49061        -1     
  Branches     17726     17712       -14     
=============================================
+ Hits         44846     44848        +2     
+ Misses        4122      4120        -2     
+ Partials        94        93        -1     

Files	Coverage Δ
...ts/SentryTests/Helper/SentryFileManagerTests.swift	99.299% <ø> (+0.173%)	⬆️

... and 5 files with indirect coverage changes

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