Adapt gaussino slots to new CMake & drop lhcb-gaussino-new-cmake
This MR adds GaussinoExtLibs project to all lhcb-gaussino*
slots and changes the Gauss-on-Gaussino's target branch from Futurev4
to Futurev5
. The temporary nightly slot for testing the new CMake configuration, lhcb-gaussino-new-cmake
, will be removed.