azure CI: remove vs2017 tests without replacement now that the image is deleted

The Windows 2016 images have been deprecated for a while now and
regularly browning out. There's no viable replacement for testing that
we can generate a usable `--backend=vs2017` project, so we cannot
migrate this to anything else.

The deprecated images are finally fully removed. See
https://github.com/actions/virtual-environments/issues/5403

And now we get universal red CI, we cannot just wait for the brownout to
end to get a tiny little bit of final testing.

Simply remove the jobs so that we can tell if all the CI that actually
runs, is passing.

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