Add `NotificationsMixin` to Custom Object model

[mrmrcoleman]

Plugin Version

commit 003c687 (HEAD -> netbox-models, origin/netbox-models)

NetBox Version

v4.2.8-Docker-3.2.0

Python Version

3.12

Steps to Reproduce

• Create a Custom Object Type X
• Create a Custom Object of type X, Y
• Subscribe to Y

Expected Behavior

I can subscribe to Y and the when Y is edited I receive a notification

Observed Behavior

There's no subscribe button

[linear]

NPL-383 Add `NotificationsMixin` to Custom Object model

Plugin Version

commit 003c687 (HEAD -> netbox-models, origin/netbox-models)

NetBox Version

v4.2.8-Docker-3.2.0

Python Version

3.12

Steps to Reproduce

• Create a Custom Object Type X
• Create a Custom Object of type X, Y
• Subscribe to Y

Expected Behavior

I can subscribe to Y and the when Y is edited I receive a notification

Observed Behavior

There's no subscribe button

[mrmrcoleman]

Tested at:

NetBox version: feature-ab8e3ee
Custom Objects version: commit 39e69419e8bf8019b7a1bc0475d8f3fe90e14178 (HEAD -> feature, origin/feature)
Author: Brian Tiemann <btman@mac.com>
Date:   Fri Aug 8 07:49:29 2025 -0400

Fixed - will be released in 0.2.0