Revert breaking change - iam_role return values (#1068) (#1071)

[PR #1068/8d80e9a0 backport][stable-3] Revert breaking change - iam_role return values

This is a backport of PR #1068 as merged into main (8d80e9a).
SUMMARY
This hasn't been release yet, so a changelog isn't needed.
While I'm generally good with cleaning up the output values here, this needs to be done as a separate breaking change, and must not be backported to stable-3.
ISSUE TYPE

Bugfix Pull Request

COMPONENT NAME
iam_role
ADDITIONAL INFORMATION
Breaking change silently introduced by #1054

Reviewed-by: Mark Chappell <None>

plugins/modules/iam_role.py

@@ -506,7 +506,8 @@ def create_or_update_role(module, client):
     role['AttachedPolicies'] = get_attached_policy_list(module, client, role_name)
     role['tags'] = get_role_tags(module, client)
 
-    module.exit_json(changed=changed, iam_role=camel_dict_to_snake_dict(role, ignore_list=['tags']))
+    camel_role = camel_dict_to_snake_dict(role, ignore_list=['tags'])
+    module.exit_json(changed=changed, iam_role=camel_role, **camel_role)
 
 
 def create_instance_profiles(module, client, role_name, path):