Add R2toR3 navigation -> DAOD slimmed navigation steering logic
This lets the navigation slimming correctly find final-features for R2->R3 converted navigation graphs where the final-feature may be a dummy feature.
Before, we had this incorrect situation for HLT_4j120 where only the dummy-feature (green) was linked into the converted graph (orange). Not the actual jets (yellow).
Afterwards we successfully skip over the dummy feature and locate the jets, we therefore correctly identify and pack their 4-vectors into the trigger's DAOD IParticle container.
This doesn't affect any DAOD production jobs as R2->R3 navigation conversion is not yet enabled by default.