Change #57031 introduced two methods in DomainObjectInterface,
which are already present in ObjectMonitoringInterface.

Undo that change.

Resolves: #57271
Releases: 6.2
Change-Id: I95852d8221a1b54c4d6a71c508666e0fb1080223
Reviewed-on: https://review.typo3.org/28745
Reviewed-by: Xavier Perseguers
Reviewed-by: Helmut Hummel
Tested-by: Markus Klein
Reviewed-by: Markus Klein