db: Improve list_datagetter_runs command

[R2ZER0]

Nicer output. Add the in_use status of each getter run.

e.g.

> ./manage.py list_datagetter_runs

id  | datetime                         | in_use
6   | 2023-10-31 14:40:06.189967+00:00 | False
7   | 2023-10-31 14:40:17.608123+00:00 | False
8   | 2023-10-31 14:58:00.374404+00:00 | False
9   | 2023-10-31 14:59:59.459714+00:00 | True
10  | 2023-11-23 12:34:30.694581+00:00 | True