Backport of Update tests to work with newer Windows into release/1.5.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #17401 to be assessed for backporting due to the inclusion of the label backport/1.5.x.

The below text is copied from the body of the original PR.

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In pursuit of moving Windows tests to GitHub Actions (#17103),

• "allow" (don't try to drop) linux capabilities in the docker test driver harness (near-term workaround for Nomad fails to run a container with Docker-CE installed on Windows #15181)
• refactor to allow different busybox images since windows containers need to be the same version as the underlying OS, and we're moving from 2016 to 2019 (images published via: hashicorp/busybox-windows)
• one docker test was flakey from apparently being a bit slower on windows, so add Wait()