Fix zone colors to honor LYR-file specification (#13658)

* #12974 Fix zone colors to honor LYR-file specification

- Map formation colors by name instead of palette index in updateFormationNamesOnPlot()
- Map formation colors by categoryValue lookup in updateCellResultLegend(), fixing
  incorrect colors when showOnlyVisibleCategoriesInLegend filters the active set
- Add RimColorLegendCollection::createColorLegendFromFormationNames() and call it
  from readAllFormationNames() so LYR colors are available after project load
- Auto-assign formation color legend when a formation case is set on a well log track
- Rename fileNameWoPath() to shortName() and switch to baseName() (no extension)
- Remove addCustomColorLegend() from RicImportFormationNamesFeature; logic now lives
  in RimColorLegendCollection
- Set formation legend when creating new Well Log Extraction Curve track

ApplicationLibCode/ProjectDataModel/Formations/RimFormationNamesCollection.cpp

@@ -20,7 +20,9 @@
 
 #include "RiaLogging.h"
 #include "RimCase.h"
+#include "RimColorLegendCollection.h"
 #include "RimFormationNames.h"
+#include "RimProject.h"
 
 CAF_PDM_SOURCE_INIT( RimFormationNamesCollection, "FormationNamesCollectionObject" );
 
@@ -44,6 +46,7 @@ void RimFormationNamesCollection::readAllFormationNames()
     for ( RimFormationNames* fmNames : m_formationNamesList )
     {
         fmNames->readFormationNamesFile( nullptr );
+        RimProject::current()->colorLegendCollection->createColorLegendFromFormationNames( fmNames );
     }
 }