Skipping TestSkaffold on Windows

[spowelljr]

TestSkaffold on Windows is failing with the following error:

ERROR: rpc error: code = Unknown desc = error getting credentials - err: exit status 1, out: `error getting credentials - err: exit status 1, out: `A specified logon session does not exist. It may already have been terminated.``

This is a known issue (docker/cli#2682) outside of our control.
tl;dr: You cannot Docker login via an elevated shell depending on your environment as it appears the credentials don't get passed through

And with our CI flow we SSH into the Windows machine which starts us in elevated permission and trying to obtain unelevated permission proves much harder than expected and requires complex work arounds.

Also tried to change Jenkins from connecting to the Windows machines from SSH to via a Windows service, however we run into issue with proxies.

So for not just going to skip this test on Windows until we find a better work around.

[vharsh]

/close

[k8s-ci-robot]

@vharsh: You can't close an active issue/PR unless you authored it or you are a collaborator.

In response to this:

/close

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