#14870 Schedule export: export multilateral wells once per well name

Wells sharing an export name now produce one WELSPECS/COMPORD record,
one set of MSW keywords, and no duplicate COMPDAT/COMPLUMP connections.
Events on any well in the group trigger the group's keywords.

Connections in cells shared by several well paths of a group are combined
into one record. MSW keywords are exported for the well tree of the first
group member selected for MSW export.

Fixes #14870

ApplicationLibCode/Commands/CompletionExportCommands/RicWellPathExportCompletionDataFeatureImpl.h

@@ -67,6 +67,11 @@ public:
     static std::vector<RigCompletionData>
         completionDataForWellPath( RimWellPath* wellPath, RimEclipseCase* eCase, const std::optional<QDateTime>& exportDate = std::nullopt );
 
+    // Completion data for several well paths (including their laterals), combined per cell into one connection.
+    static std::vector<RigCompletionData> completionDataForWellPaths( const std::vector<RimWellPath*>& wellPaths,
+                                                                      RimEclipseCase*                  eCase,
+                                                                      const std::optional<QDateTime>&  exportDate = std::nullopt );
+
     static std::pair<double, cvf::Vec2i>
         wellPathUpperGridIntersectionIJ( const RimEclipseCase* gridCase, const RimWellPath* wellPath, const QString& gridName = "" );