Fix Finder Sync Extension

[claucambra]

This PR fixes the broken Finder Sync Extension in master. Specifically:

• Fixes issues in the xcodeproj that would lead to the sytem not running the appex
• Fixes broken code in the parsing for incoming bytes over the socket with the desktop client
• Fixes the optional compile if the File Provider module

Closes #5755

[codecov]

Codecov Report

Merging #5903 (cd67afc) into master (8fc3c99) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head cd67afc differs from pull request most recent head 1e9dbf8. Consider uploading reports for the commit 1e9dbf8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5903      +/-   ##
==========================================
+ Coverage   60.08%   60.10%   +0.01%     
==========================================
  Files         145      145              
  Lines       18762    18746      -16     
==========================================
- Hits        11273    11267       -6     
+ Misses       7489     7479      -10     

see 5 files with indirect coverage changes

[allexzander]

@claucambra kindly check my comments

[claucambra]

/backport to stable-3.9

[nextcloud-desktop-bot]

AppImage file: nextcloud-PR-5903-1e9dbf8f14f12331cd065c9d2c37b5d9e67995b5-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.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[backportbot-nextcloud]

The backport to stable-3.9 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable-3.9
git pull origin stable-3.9

# Create the new backport branch
git checkout -b fix/foo-stable-3.9

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts. Resolve them.
git cherry-pick abc123

# Push the cherry pick commit to the remote repository and open a pull request
git push origin fix/foo-stable-3.9

More info at https://docs.nextcloud.com/server/latest/developer_manual/getting_started/development_process.html#manual-backport

[claucambra]

Backport attempt was a mistake, no need as file provider inclusion was reverted in stable-3.9