Refactor depth property handling for regular surfaces

- Introduce RimRegularFileSurface::propertyName() as canonical property key for file-based surfaces.
- Change RimRegularSurface::setPropertyAsDepth() to void and remove existence check; error handling is now in updateSurfaceData().
- Update all usages to match new setPropertyAsDepth() behavior.
- Log and handle missing depth property in updateSurfaceData().
- Update tests to reflect new error handling approach.
- Minor includes and logging improvements.

ApplicationLibCode/ProjectDataModel/Surfaces/RimSurfaceCollection.cpp

@@ -151,6 +151,7 @@ RimSurface* RimSurfaceCollection::createSurfaceFromFile( const QString& fileName
     {
         auto regularFileSurface = new RimRegularFileSurface;
         regularFileSurface->setFilePath( fileName );
+        regularFileSurface->setPropertyAsDepth( RimRegularFileSurface::propertyName() );
         newSurface = regularFileSurface;
     }
     else