* Add non-deletable flag for service users
* fix non deletable service user created as deletable
* Exclude non deletable service users in service users api response
* Fix broken tests
* Add test for non deletable service user
* Add handling for non-deletable service users in tests
* Remove non-deletable service users when fetching all users
* Ensure non-deletable users are filtered out when fetching all user data
* extends user and group structure by introducing fields for issued and integration references
* Add integration checks to group management to prevent groups added by integration.
* Add integration checks to user management to prevent deleting user added by integration.
* Fix broken user update tests
* Initialize all user fields for testing
* Change a serializer option to embedded for IntegrationReference in user and group models
* Add issued field to user api response
* Add IntegrationReference to Group in update groups handler
* Set the default issued field for users in file store
The new functionality allows blocking a user in the Management service.
Blocked users lose access to the Dashboard, aren't able to modify the network map,
and all of their connected devices disconnect and are set to the "login expired" state.
Technically all above was achieved with the updated PUT /api/users endpoint,
that was extended with the is_blocked field.
