End to End Integ Test

[webern]

Create an end-to-end integ test that, with minimal human intervention. General requirements:

• Use a pre-existing ECS cluster.
• Detect pre-existing instances in the cluster and abort with error informing the user that the cluster should be empty.
• Create multiple nodes taking a Bottlerocket AMI (version < latest), or getting it from SSM.
• Create a workload service and run it on the nodes.
• Assert health of the workload throughout test?
• Containerize and deploy the local changeset version of bottlerocket-update-operator to an ECR repo.
• Run the updater in a Fargate task.
• Assert the nodes do update.
• Cleanup.

[srgothi92]

In PR-68 and PR-69 we added Cloudformation stacks to create an ECS cluster and added script that allows us to create an ECS cluster, start updater on it and clean-up the resources. For now we are relying on manual validation of logs and Bottlerocket OS version. An issue #76 is created to track automated integration tests.