[#5034] Fix object ownership in Objects API

[vaszig]

Closes #5034

Changes

• Added regression tests
• Updated object ownership validation to be triggered only when the object needs update

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • Checked copying a form
  • Checked import/export of a form
  • Config checks in the configuration overview admin page
  • Problem detection in the admin email digest is handled

• Release management

  • I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • Ran ./bin/makemessages_js.sh
  • Ran ./bin/compilemessages_js.sh

• Dockerfile/scripts

  • Updated the Dockerfile with the necessary scripts from the ./bin folder

• Commit hygiene

  • Commit messages refer to the relevant Github issue
  • Commit messages explain the "why" of change, not the how

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.72%. Comparing base (bc1cc34) to head (8e71ffc).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5062      +/-   ##
==========================================
+ Coverage   96.71%   96.72%   +0.01%     
==========================================
  Files         770      770              
  Lines       26489    26491       +2     
  Branches     3453     3454       +1     
==========================================
+ Hits        25618    25623       +5     
+ Misses        607      606       -1     
+ Partials      264      262       -2     

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

[robinmolen]

A bit of nit picking :)

Besides this, it looks good to me!

[sergei-maertens]

Backported to 3.0.x in b74ea05