PWGJE: Add jet-cross-section-efficiency task for step-by-step event selection QA

- Add new task jetCrossSectionEfficiency.cxx for MC particle-level jet cross-section efficiency analysis
- Implement soft-coded event selection chain based on eventSelections configurable
- Support all JCollisionSel bits as individual stages in QA histograms
- Add event-level counters (h_mccollisions_eventselection) with same cut chain as jet-level histograms
- Update CMakeLists.txt to register new DPL workflow

Author: joonsukbae

PWGJE/Tasks/CMakeLists.txt

@@ -314,6 +314,10 @@ if(FastJet_FOUND)
                         SOURCES jetSpectraEseTask.cxx
                         PUBLIC_LINK_LIBRARIES O2::Framework O2Physics::PWGJECore O2Physics::AnalysisCore
                         COMPONENT_NAME Analysis)
+    o2physics_add_dpl_workflow(jet-cross-section-efficiency
+                        SOURCES jetCrossSectionEfficiency.cxx
+                        PUBLIC_LINK_LIBRARIES O2::Framework O2Physics::PWGJECore O2Physics::AnalysisCore
+                        COMPONENT_NAME Analysis)
     o2physics_add_dpl_workflow(gamma-jet-tree-producer
                         SOURCES gammaJetTreeProducer.cxx
                         PUBLIC_LINK_LIBRARIES O2::Framework O2::EMCALBase O2::EMCALCalib O2Physics::PWGJECore O2Physics::AnalysisCore