Extend test db to include a made-up kit with unassigned sample(s) and put its kit name in yaml as example

YAML example fills in a kit name that has no available samples in the test database. We need to be ready to give them a kit_name they can use to play with samples so they can build out this part of their UI. Seems unnecessary as a yaml change, can send it along in their instructions, but putting it in the yaml wouldn't hurt either.

No specific file or test is named. Locate the test database and the YAML example, then check how kits and unassigned samples are represented. Done means the example kit name resolves to a made-up kit with at least one usable unassigned sample in the test database.

Written by the indexing model from the issue text.