Mark cloudformation_exports_info tests stable again, we're not runnin…

…g so much in parallel so we shouldn't have the capacity related issues we were seeing (ansible-collections#1349)

Mark cloudformation_exports_info tests stable again

SUMMARY
fixes: ansible-collections#157
re-enable the cloudformation_exports_info tests.  The CI account isn't as busy these days because we don't run "full" integration tests anywhere near as often any more.  This should mean that the (likely) capacity related issues we were seeing should be gone.
ISSUE TYPE

Bugfix Pull Request

COMPONENT NAME
cloudformation_exports_info
ADDITIONAL INFORMATION

Reviewed-by: Alina Buzachis <None>

tests/integration/targets/cloudformation_exports_info/aliases

@@ -1,4 +1 @@
-# https://github.com/ansible-collections/community.aws/issues/157
-unstable
-
 cloud/aws