[PWGLF] Fix UPC and cascade task lint checks

Remove redundant conditions and initialization, avoid histogram registry shadowing, and mark particle-type branches as compile-time decisions. Suppress cppcheck false positives only on those template comparisons. Restore the MC FT0M centrality join needed by cascqaanalysis.

Author: nepeivodaRS

PWGLF/TableProducer/Strangeness/cascqaanalysis.cxx

@@ -670,7 +670,7 @@ struct Cascqaanalysis {
     }
   }
 
-  void processMCgen(soa::Join<aod::McCollisions, >::iterator const& mcCollision, // mcCollision.centFV0A() to be added
+  void processMCgen(soa::Join<aod::McCollisions, aod::McCentFT0Ms>::iterator const& mcCollision, // mcCollision.centFV0A() to be added
                     aod::McParticles const& mcParticles,
                     const soa::SmallGroups<o2::soa::Join<o2::aod::Collisions, o2::aod::McCollisionLabels, o2::aod::EvSels, aod::PVMults, aod::FT0Mults, aod::CentFT0Ms, aod::CentFV0As>>& collisions,
                     BCsWithBcSels const&,

PWGLF/Tasks/Strangeness/cascpostprocessing.cxx

@@ -556,7 +556,7 @@ struct LfCascpostprocessing {
         if (TMath::Abs(candidate.massxi() - o2::constants::physics::MassXiMinus) < masswintpc) {
           isCandidate = 1;
         }
-      } else if (!isXi) {
+      } else {
         if (isMC) {
           isCorrectlyRec = ((TMath::Abs(candidate.mcPdgCode()) == PDG_t::kOmegaMinus) && (candidate.isPrimary() == 1)) ? 1 : 0;
         }