Fix tags in ec2_instance_facts (#30333)

* Fix tags in ec2_instance_facts
The method boto3_tag_list_to_ansible_dict in module_utils/ec2.py changed
and does no longer check whether the returned result of boto3 uses
"key" or "Key" as the tag key identifier.
This fixes ec2_instance_facts to make this check in its own, since boto3
may return "key" instead of "Key"

* Since the indices for the tags are already formatted to lowercase
by the snaking, we can assume, that the index for the tags are already
formatted

lib/ansible/modules/cloud/amazon/ec2_instance_facts.py

@@ -500,8 +500,7 @@ def list_ec2_instances(connection, module):
 
     # Turn the boto3 result in to ansible friendly tag dictionary
     for instance in snaked_instances:
-        if 'tags' in instance:
-            instance['tags'] = boto3_tag_list_to_ansible_dict(instance['tags'])
+        instance['tags'] = boto3_tag_list_to_ansible_dict(instance.get('tags', []), 'key', 'value')
 
     module.exit_json(instances=snaked_instances)