Unable to Edit or Delete Collaborators Class Properties

### Description of the issue

A clear and concise description of the issue.

### Your environment

* Huly v0.6.337
* Arc Version 1.67.2 (55679) Chromium Engine Version 130.0.6723.117
* MacOS 15.1

### Steps to reproduce

1. From a Person object, open the Class settings for Collaborators (This is necessary as the Collaborators class is not visible in the Classes list under Class settings)
2. Add a Custom Property to the Collaborators class
3. After creating the custom property, try to edit it. Notice that the app will refuse to open the edit modal.

### Expected behaviour

The edit modal opens when the custom property is clicked.

### Actual behaviour

The class property edit modal does not open, and in the console an uncaught promise error is reported.
The text of the error is:Uncaught (in promise) Error: domain not found: notification:mixin:Collaborators


### Possible solutions

define the notification mixin for Collaborators

_{Huly®: UBERF-8722}