Dav respect disallow sharing with groups

[tcitworld]

Replaces #25391 (didn't see it straight away 🙈) and adds tests.

Fixes #25390
Fixes nextcloud/calendar#2744

Todo

• Create follow up issues in the other apps (contacts, calendar, talk, ....) to remove "groups" from their placeholders
  • Talk Remove group labels when sharing with groups is not allowed spreed#5360
  • Calendar Disabling calendar sharing with groups calendar#2744
  • Contacts Don't show groups in share placeholder if group sharing is disabled contacts#2242

[PVince81]

not sure if enough as there's another PR here for ShareesAPIController with more changes: #25744

[tcitworld]

not sure if enough as there's another PR here for ShareesAPIController with more changes: #25744

It doesn't seem to be the same though, #25744 is about respecting which groups can be shared with, and this one (and #25391) is about respecting the allow/disallow sharing with any group.

[PVince81]

👍 tested with Talk.
The groups are not visible in the search any more when creating a conversation.

[PVince81]

build restarted

[nickvergessen]

Btw your todo should be solved already with the changes here as most of the apps are using the collaboration endpoint (GroupPlugin class) or the dav principal thing which you both modified

[PVince81]

Follow up Talk ticket: nextcloud/spreed#5360

I do have some small doubts: because creating a conversation is not strictly about sharing, just adding people. It just happens that Talk is using the sharing API there so is affected by this restriction.

[tcitworld]

Btw your todo should be solved already with the changes here as most of the apps are using the collaboration endpoint (GroupPlugin class) or the dav principal thing which you both modified

Not sure what you mean, it was just about hiding "group" from placeholders like @PVince81 did with Talk.