Refs #5121 Convert result to use to string instead of workspace.
Refs #5121 Update reference results for Fury.

These where originally wrong as FuryFit crops the input workspace, modifying
the resulting workspace. FuryFit now doesn't crop the input directly and so these
results test the direct output of Fury.
Refs #5121 Update reference results for FuryFitSeq

FuryFit results now have slightly shifted x values because of the swap to
use ConvertSpectrumAxis.
Refs #5121 Add system test for FuryFitMulti
Merge branch 'feature/5121_furyfit_fix_params' into develop