[QA] Notification settings Tests

[kobergj]

With #10706, #10792 and #10779 it is now possible to choose which notifications you want to receive.

Up-To-Date list of available notifications can be found at https://localhost:9200/api/v0/settings/bundles-list

Users can decide per event if they want to receive it per email or in-app or not at all. It would be great to have some api tests for that.

Compare also the original epic: https://github.com/owncloud/enterprise/issues/6715

[nirajacharya2]

event	pr
Share created	#10828
Share removed
Share expired
Share shared
Share unshared
Space membership expired
Space disabled
Space deleted
Postprocessing Step Finished
all events	#10820

• test for notification timings (instant,never..)