#13126 RiaLogging: Extract errorInMessageBox to RiuMessageDialog

Move the QMessageBox-displaying helper out of the logging utility into a
dedicated UI class. RiaLogging.h no longer pulls QMessageBox/QWidget into
the ~270 files that include it. Behavior is preserved: showError displays
the dialog when running interactively (and not under regression tests),
then forwards the text to RiaLogging::error.

ApplicationLibCode/ProjectDataModel/GeoMech/RimGeoMechView.cpp

@@ -23,6 +23,7 @@
 #include "RiaLogging.h"
 #include "RiaPreferences.h"
 #include "RiaRegressionTestRunner.h"
+#include "RiuMessageDialog.h"
 
 #include "RicfCommandObject.h"
 
@@ -173,7 +174,7 @@ void RimGeoMechView::onLoadDataAndUpdate()
                 QString displayMessage = errorMessage.empty() ? "Could not open the Odb file: \n" + m_geomechCase->gridFileName()
                                                               : QString::fromStdString( errorMessage );
 
-                RiaLogging::errorInMessageBox( Riu3DMainWindowTools::mainWindowWidget(), "File open error", displayMessage );
+                RiuMessageDialog::showError( Riu3DMainWindowTools::mainWindowWidget(), "File open error", displayMessage );
             }
 
             m_geomechCase = nullptr;