[aws] Fix IAM role name parsing to come from the ARN (#46076)

* [aws] Change IAM role name parsing to come from the ARN (#45534)

(cherry picked from commit fe6b7f6b5d)

* Changelog

changelogs/fragments/54434-iam-role-arn-parsing.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - ec2_metadata_facts - Parse IAM role name from metadata ARN instead of security credential field.

lib/ansible/modules/cloud/amazon/ec2_metadata_facts.py

@@ -467,8 +467,8 @@ class Ec2Metadata(object):
         new_fields = {}
         for key, value in fields.items():
             split_fields = key[len(uri):].split('/')
-            if len(split_fields) == 3 and split_fields[0:2] == ['iam', 'security-credentials']:
-                new_fields[self._prefix % "iam-instance-profile-role"] = split_fields[2]
+            if len(split_fields) == 2 and split_fields[0:2] == ['iam', 'info_instanceprofilearn']:
+                new_fields[self._prefix % "iam-instance-profile-role"] = value.split('/')[1]
             if len(split_fields) > 1 and split_fields[1]:
                 new_key = "-".join(split_fields)
                 new_fields[self._prefix % new_key] = value