* Enable ec2_transit_gateway test in CI.
* Mark the test unstable.
The test sometimes attempts to delete the transit gateway while it
is in the pending state, which is not permitted.
* AWS: new module ec2_transit_gateway fixes#49376
* Add permissions neeeded for integration tests
* uncomment nolog on creds
* add unsupported to integration test aliases
* remove the shippable/aws/group alias so doesn't conflict with unsupported