feat: celeritas: require +root
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Avoid errors like:
jug_dev> wdconinc@menelaos:~/git/epic$ celer-export-geant epic.gdml '' output.json
info: Using default Celeritas Geant4 options
status: Initializing Geant4 run manager
status: Initializing Geant4 geometry
info: Loading Geant4 geometry from GDML at epic.gdml
status: Building Geant4 physics tables
status: Transferring data from Geant4
status: Loading external elemental data
info: Opening JSON output at output.json
/tmp/root/spack-stage/spack-stage-celeritas-0.5.0-luyvi73exkq3jx55muwzls2cmatui6dc/spack-src/app/celer-export-geant.cc:193: critical: Runtime error: celeritas: configuration error: required dependency is disabled in this build: ROOT