Move XElementAccess Java tests to C++ for ScLabelRangesObj.

Change-Id: Icf49fb7e8c24b169e4fe33ffed8cc1412d21f9e8
Reviewed-on: https://gerrit.libreoffice.org/64432
Tested-by: Jenkins
Reviewed-by: Jens Carl <j.carl43@gmx.de>