[stable-3.9] Added new state and new job to check if /index.php/204 is being redirected

[backportbot-nextcloud]

Backport of #5848

[codecov]

Codecov Report

Merging #5894 (e4816de) into stable-3.9 (473fb2f) will decrease coverage by 0.13%.
The diff coverage is 53.57%.

Additional details and impacted files

@@              Coverage Diff               @@
##           stable-3.9    #5894      +/-   ##
==============================================
- Coverage       60.54%   60.41%   -0.13%     
==============================================
  Files             145      145              
  Lines           18612    18640      +28     
==============================================
- Hits            11269    11262       -7     
- Misses           7343     7378      +35     

Impacted Files	Coverage Δ
src/libsync/abstractnetworkjob.cpp	72.24% <ø> (+1.14%)	⬆️
src/libsync/abstractnetworkjob.h	53.84% <ø> (ø)
src/libsync/networkjobs.h	12.50% <0.00%> (-0.55%)	⬇️
src/libsync/networkjobs.cpp	59.30% <55.55%> (-0.94%)	⬇️

... and 4 files with indirect coverage changes

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

1.9% Coverage
0.0% Duplication

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

[nextcloud-desktop-bot]

AppImage file: nextcloud-PR-5894-e4816de836ab7e4e7d14cadfcda2632ac249e738-x86_64.AppImage

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

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