[stable-3.10] Unhide discovery logs for file deleted on the server and for discovered file

[backportbot-nextcloud]

Backport of #6112

[codecov]

Codecov Report

Merging #6116 (338b21b) into stable-3.10 (608452b) will increase coverage by 0.13%.
Report is 1 commits behind head on stable-3.10.
The diff coverage is 100.00%.

Additional details and impacted files

@@               Coverage Diff               @@
##           stable-3.10    #6116      +/-   ##
===============================================
+ Coverage        60.33%   60.46%   +0.13%     
===============================================
  Files              145      145              
  Lines            18793    18798       +5     
===============================================
+ Hits             11338    11366      +28     
+ Misses            7455     7432      -23     

Files	Coverage Δ
src/libsync/discovery.cpp	86.48% <100.00%> (+0.06%)	⬆️

... and 1 file with indirect coverage changes

[sonarqubecloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

100.0% Coverage
0.0% Duplication

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[nextcloud-desktop-bot]

AppImage file: nextcloud-PR-6116-338b21b7df199ee8da1afb5d6d5da5e46c32bcbc-x86_64.AppImage

To test this change/fix you can simply download above AppImage file and test it.

Please make sure to quit your existing Nextcloud app and backup your data.