Implement `get_display_value` on all field types where necessary

[mrmrcoleman]

Plugin Version

commit de5e8c0 (HEAD -> public-preview, origin/public-preview)

NetBox Version

v4.2.8-Docker-3.2.0

Python Version

3.12

Steps to Reproduce

• Create a set of Custom Field Choices A with [1, 2]
• Create a Custom Object Type X
• Add a multi-selection field to X
• Create a Custom Object of type X, Y
• Edit the multi-selection field on Y and select both 1 and 2
• Look at the detail view of the Custom Object type Y

Expected Behavior

As this is the only field on the Custom Object Type, it is selected as the Primary

I would therefore expect the "name" of the Custom Object to be 1, 2

Observed Behavior

The "name" of the Custom Object in the detail view is ['1', '2']