Decommissioning design - changeset issue

[mzbroch]

Environment

• Python version:
• Nautobot version: 1.6/LTM
• nautobot-design-builder version: 1.3.0

Expected Behavior

In a "design view", after a design is decommissioned, a changeset allows to see the design revisions / history and shows valid number of records.

Observed Behavior

In a "design view", after a design is decommissioned, a changeset view indicates a number of objects before a design was decommissioned.
Ie. If there were 15 objects before decommission, after decommission "change records" indicate 15 (instead of 0).

Also, if design is decommission, I would like to know what were the past values.

Steps to Reproduce

1. Create design
2. Decommission a design
3. Navigate to design instance and check design objects panel