Revive test suite on Windows

[basil]

No description provided.

[dduportal]

The test Harness seems to assume that Docker on Windows only runs Linux containers while our VM agents, today, are only providing Windows containers on Windows VMs. So it errors with a message such as docker: no matching manifest for windows/amd64 10.0.17763 in the manifest list entries.. For instance httpd or maven official Docker images.

It also fails for the SCRATCH image which does not exist on Windows.

@jtnord did already open an issue to request having a Docker Engine able to run Linux containers on Windows agents: jenkins-infra/helpdesk#3548

=> Is this a case we want to support with this plugin? It would mean supporting Windows agents with Docker Desktop on them, running in "Linux mode" (which is the default case for developer Windows machines with WSL usually, but is it for Jenkins agents?)

[MarkRx]

@dduportal I actually just added to support checking the docker OS mode as a necessity in this in a PR I pushed up here.

See #332