Show units that ran near the service, but weren't matched

[danielgavrilov]

When the algorithm fails to match a service to a unit, seeing units that ran close to the service will help the user find out likely matches. All these should already be in the service matchings table in the database, but they are currently filtered out to show only the most likely matches.

This task involves exposing the matchings from the database table and finding a way to display them on the client-side.