fdo#54938 Convert sfx2, xmloff and connec.. to cppu::supportsService

Change-Id: Ib5d3aabf8aa88ec24e44584047d0405a09fa44ed
Reviewed-on: https://gerrit.libreoffice.org/7864
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Marcos Souza <marcos.souza.org@gmail.com>