FEAT: Replace best jpg endpoint (#2944)

* Added object thumbnail def and made camera tracked objects use it.

* Add object snapshot def

* Remove documentation for best.jpg

* Update docs for label thumbnail and snapshot defs

web/src/routes/Camera.jsx

@@ -134,7 +134,7 @@ export default function Camera({ camera }) {
               key={objectType}
               header={objectType}
               href={`/events?camera=${camera}&label=${objectType}`}
-              media={<img src={`${apiHost}/api/${camera}/${objectType}/best.jpg?crop=1&h=150`} />}
+              media={<img src={`${apiHost}/api/${camera}/${objectType}/thumbnail.jpg`} />}
             />
           ))}
         </div>