Error when service manager tries to remove themselve from service

[baszoetekouw]

https://github.com/SURFscz/SBS/assets/1461740/782984d6-a273-40d3-b2ee-b9feff06d86a

• Allow service admins and managers to remove themselves from the service.

Removing yourself is consistent with other admin roles and the invitation concept. For organisation, we have blocked removing the last admin.

[HarryKodden]

Test Ok !