Final fits integration

Complied finalFits inside singularity. Added one job template for signal modelling.

test command:

law run FinalFitSignalFits --version test --FinalFitSignalFits-inputWSDir=/eos/cms/store/group/phys_higgs/cmshgg/tutorials/HiggsDNA_FinalFits_2024/FinalFits_tutorial/workspaces/