[TECH SUPPORT] LPS-33802 AssetTags are not being deleted when group is deleted

Hey Julio,

The problem and fix as well is simple and easy, the asset tags associated with a group are not being deleted when the group is deleted.

For me the solution seems fine, I've only applied source formatting, but I wanted someone to double check it as well.

I also wrote some test cases, those are simple too.

Thanks,

Máté