[BeamAdapter.CUDA] Fix for refactored SofaCUDA cmake, and overall fix compilation

[fredroy]

I guess nobody is using those instantiations 😅

[fredroy]

Thanks @fredroy

Any idea why the CI tries to configure the CUDA project?

it was because the CUDA language keyword was set in the main Cmakefile (instead of only the sub-project beamadapter.cuda) 🤦🏻‍♂️