capture_infra_targets: follow host assumptions
capture_infra_targets: follow host assumptions

for capture_vm_targets, only passing in hosts.
no longer need to prequalify that it
is a host, has ci mixin, or responds_to vms

The host's cluster must be enabled (if present)
but tests expect host to also be enabled so still checking that.

While the hosts did come from an ems, there is no guarentee
that the vm is still linked to an ems, so still checking that

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