Add Windows Server 2022 CI runs

GA for ws2022 github actions VMs launched a couple weeks ago so seems like
it's time to try out the CI on this new SKU.

This involved adding new ws2022 runs for the OS matrices in the CI, fixing up
a test in the platforms package and adding a mapping for the ws2022 container image in
integration/client.

Signed-off-by: Daniel Canter <dcanter@microsoft.com>

integration/client/image_test.go

@@ -81,7 +81,7 @@ func TestImagePullWithDistSourceLabel(t *testing.T) {
 	var (
 		source   = "k8s.gcr.io"
 		repoName = "pause"
-		tag      = "3.5"
+		tag      = "3.6"
 	)
 
 	ctx, cancel := testContext(t)