[stable31] fix(files): Remove obsolete loading code from old API, add public shared id to enabled view

[backportbot]

Backport of #7157

Warning, This backport's changes differ from the original and might be incomplete ⚠️

Todo

• Review and resolve any conflicts
• Amend HEAD commit to remove the line stating to skip CI

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.57%. Comparing base (cb0fcd6) to head (a467d56).
Report is 4 commits behind head on stable31.

Additional details and impacted files

@@             Coverage Diff              @@
##           stable31    #7181      +/-   ##
============================================
+ Coverage     51.87%   58.57%   +6.69%     
============================================
  Files           287      286       -1     
  Lines         40922    36024    -4898     
  Branches        794      794              
============================================
- Hits          21229    21100     -129     
+ Misses        19572    14803    -4769     
  Partials        121      121              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.