[cloud] Return target_group_names where sensible in ec2_asg_facts module (#26078)
[cloud] Return target_group_names where sensible in ec2_asg_facts module (#26078)

If target_group_arns is an empty list, then return
an empty target_group_names list.

If a connection to elbv2 is not obtainable, then it is
not possible to return target_group_names
thaim/ansible,thaim/ansible