EmulatorPkg: Add Windows CLANGPDB CI

CLANGPDB build of EmulatorPkg is supported on Windows, but not Linux.

In order to complete CLANGPDB CI, introduce an Azure pipelines file to
run this build. The file is a duplicate of current Windows-VS.yml in the
same directory simply with the toolchain changed, similar to the approach
taken in recent commits to add Ubuntu CLANGDWARF and CLANGPDB CI.

Signed-off-by: Mike Beaton <mjsbeaton@gmail.com>