TryRecoverPersistedSession logs debug if file doesnt exist

[Tyrrrz]

Log a debug entry instead of an error because it's an expected error (TryRecoverPersistedSession() is called every time a session is started for the first time, but a left over file will actually exist very rarely).

[codecov-commenter]

Codecov Report

Merging #1123 (ddf44ab) into main (806c489) will increase coverage by 0.00%.
The diff coverage is 85.71%.

@@           Coverage Diff           @@
##             main    #1123   +/-   ##
=======================================
  Coverage   80.64%   80.64%           
=======================================
  Files         197      197           
  Lines        6583     6589    +6     
  Branches     1452     1453    +1     
=======================================
+ Hits         5309     5314    +5     
  Misses        802      802           
- Partials      472      473    +1     

Impacted Files	Coverage Δ
src/Sentry/GlobalSessionManager.cs	70.86% <85.71%> (+0.30%)	⬆️

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[bruno-garcia]

Thank you

[github-actions]

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