Revert "NXP-15474: move nuxeo-platform-spreadsheet to optional addons"

This reverts commit 81061236dd5207379a358ab0cb4bdafb2f4cb34d.

This module can be added back to non-optional addons now that Jenkins slaves areready for its build, see NXBT-821
NXP-15474: move nuxeo-platform-spreadsheet to optional addons again