feat(heureka): Edit service owners

[hodanoori]

Pull Request Details

• Note: The API supports adding or removing only one user at a time from the owner list.
• On the service details page, to add a new owner, click the "+" icon in the "Owner" cell, select a user from the combo box, and click "Add". The newly added owner will then appear as a pill.
• Existing owners are displayed as pills with a remove (x) option. When attempting to remove an owner, a confirmation dialog is displayed to ensure the user wishes to proceed.
• If a user switches to another service's details while in edit mode to add an owner, the edit mode is exited, and the newly selected service details are shown in display mode.
• A success message is displayed upon successfully adding or removing an owner.

[ArtieReus]

lgtm

[TilmanHaupt]

If you change between the details views the pills stay from the old detail. I would think about cleaning them till new ones are loaded after changing the detailView. Also fixing size of the header-colum could be considered as talked in the sync.