Fixes #20422: Allow Aggregate and Prefix to filter by family in GraphQL

[rinna11]

Fixes: #20422

This allows AggregateFilter and PrefixFilter to filter by their family similar with IPAddressFilter.
I've tested the following queries manually:

aggregate_v6: aggregate_list(filters: {family: FAMILY_6}) {
    prefix
}
prefixes_v4: prefix_list(filters: {family: FAMILY_4}) {
    prefix
    role {
      name
    }
    vrf {
      name
    }
    vlan {
      vid
    }
}