Filter out Racks from Floor Plan Tile Form if the are already installed on a floor plan

[djhoward12]

Environment

• Nautobot version: 2.0.0+
• nautobot-floor-plan version: 2.3.o

Proposed Functionality

A Rack should not be an option in the Dynamic Model Choice Field if it has already been installed on a Tile in a Floor plan. It can be very cumbersome to add racks and deal with validation errors if they are already installed and if there are many racks you might not remember which ones were already installed.

Use Case

As a user I should not see a Rack as an option to be placed on a Floor Plan Tile if It has already been installed on a Floor plan in that location.