Include the `description` field in "brief" REST API serializations

[jeremystretch]

NetBox version

v3.7.3

Feature type

New functionality

Proposed functionality

Currently, "brief" mode REST API responses do not include an object's description:

# GET /api/dcim/sites/1/?brief=true
{
    "id": 1,
    "url": "http://netbox:8000/api/dcim/sites/1/",
    "display": "DM-NYC",
    "name": "DM-NYC",
    "slug": "dm-nyc"
}

This proposal is to include the description field in this output, where applicable.

Use case

Following #13283, the description field can be included on dynamically-populated dropdown fields to convey additional context about each object. It is also likely useful in many other scenarios, and its inclusion imposes no significant performance penalty.

Database changes

None

External dependencies

None