Move UNO Api helper form to include/, so it can be used outside of
directory test/.

Change-Id: I9392f44df8a93d2b5ee092b0458aeef12f99fc7a
Reviewed-on: https://gerrit.libreoffice.org/69936
Tested-by: Jenkins
Reviewed-by: Jens Carl <j.carl43@gmx.de>