Remove hosts from local inventory by (unique) name instead of hostname during checkin

[tpapaioa]

In some cases, the hostname attribute is not set or available on AAP hosts. For example:

Id | Hostname              | Name
0  | Unknown               | tpapaioa-AAP-MR1
1  | Unknown               | tpapaioa-AAP-MR2
2  | host1.example.com     | tpapaioa-rhel-9.5-3

If I check in one of these hosts, then broker removes all of them from inventory.yaml, instead of just the one that was removed from AAP:

$ broker checkin 0
[....]
$ broker inventory
Id | Hostname              | Name
0  | host1.example.com     | tpapaioa-rhel-9.5-3

This PR updates Broker.checkin() to pass the host's unique name attribute instead, so that only the given hosts are removed from the inventory.