Add comments to the disabled/unsupported integration test aliase files (

ansible-collections#411)

Add some additional comments so we know *why* the various tests aren't running.  Looks like most of them just need policy updates

This commit was initially merged in https://github.com/ansible-collections/community.aws
See: ansible-collections/community.aws@0d24559

tests/integration/targets/iam_user/aliases

@@ -1,3 +1,9 @@
+# reason: missing-policy
+# It should be possible to test iam_user by limiting which policies can be
+# attached to the users.
+# Careful review is needed prior to adding this to the main CI.
+unsupported
+
 cloud/aws
+
 iam_user_info
-unsupported