Remove Windows CI stubs from hack/

Signed-off-by: John Howard <jhoward@microsoft.com>

hack/make/validate-dco

@@ -1,7 +0,0 @@
-#!/bin/bash
-#
-# This file is a stub. It exists because windowsRS1 calls this script directly 
-# instead of using a proper interface. It should be removed once windows CI is 
-# fixed.
-#
-$SCRIPTDIR/validate/dco

hack/make/validate-gofmt

@@ -1,7 +0,0 @@
-#!/bin/bash
-#
-# This file is a stub. It exists because windowsRS1 calls this script directly 
-# instead of using a proper interface. It should be removed once windows CI is 
-# fixed.
-#
-$SCRIPTDIR/validate/gofmt

hack/make/validate-pkg

@@ -1,7 +0,0 @@
-#!/bin/bash
-#
-# This file is a stub. It exists because windowsRS1 calls this script directly 
-# instead of using a proper interface. It should be removed once windows CI is 
-# fixed.
-#
-$SCRIPTDIR/validate/pkg-imports