#14596 Name the remaining unnamed OpenMP critical sections

All unnamed critical regions map to the same implicit name, so a single process wide lock was shared by summary import, geometry generation, grid bounding box computation and NNC merging. Unrelated parallel loops therefore serialized against each other.

Give each region a critical_section_ name describing what it protects. The two regions guarding RifOpmCommonEclipseSummary::sm_createdEsmryFileCount deliberately share one name, as they protect the same counter.

ApplicationLibCode/ReservoirDataModel/RigMainGrid.cpp

@@ -989,7 +989,7 @@ void RigMainGrid::buildCellSearchTree() const
             threadIndicesForBoundingBoxes.shrink_to_fit();
             threadBoundingBoxes.shrink_to_fit();
 
-#pragma omp critical
+#pragma omp critical( critical_section_RigMainGrid_buildCellSearchTree )
             {
                 cellIndicesForBoundingBoxes.insert( cellIndicesForBoundingBoxes.end(),
                                                     threadIndicesForBoundingBoxes.begin(),