Transfer ownership

[juliusknorr]

Rebased version of #1955

closes#1306

ToDo:

• Ensure that unit tests pass
• Make sure that psalm static code analysis passes
• Add integration tests for transferring a board with example data to a different user
• Follow up PR: UI
  • Create API endpoint to trigger the transfer logic
  • Add option to the UI to transfer a board to a different user

[stefan-niedermann]

Will there also be some kind of REST API?

[juliusknorr]

As of now this is only an occ command for admins. Whenever we expose it as a feature to users we will add an API for the user interface that can be used for the apps as well then.

[juliusknorr]

@matchish I took the liberty to rebase and adjust some small issues i found during testing. Would be great if you could have another look if all that makes sense to you.

The major change is that when transfering ACL rules it should be enough to just drop the one for the new owner. The old owner will no longer have access unless there is a new rule added manually afterwards.

[estan]

It would be great if some dev could find time to review this. We have employees leaving and naturally want to transfer the ownership of some of their boards to other members of the team. We rather not mess about with running manual SQL statements against our database, even if it is probably safe if we get it right.

[max-nextcloud]

I rebased this, will look into the failing tests and review the code changes next.

[juliusknorr]

/backport to stable23

[juliusknorr]

/backport to stable22