Support multiple containers for pod logs
Problem to solve
In https://gitlab.com/gitlab-org/gitlab-ee/issues/12819, we discovered that the pod log feature doesn't work on pods with more than one container. As a short-term fix, we decided to show the first container by default. But, we should allow users to see all of the containers and to select which one they want to see the log for.
After the user clicks through to a specific pod log from the environments page, they will now see a
containers dropdown in addition to the