TaskTree: Rename StopWithDone -> StopWithSuccess

Make naming consistent with recent changes.
"Done" is meant to be an event name when the task / group
finishes. "Done" may finish with "Success" or an "Error".

This addresses the 26th point in the task below.

Task-number: QTCREATORBUG-28741
Change-Id: I53ed6905b1c385c398f49e122e8ca60aa3ad0806
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/autotoolsprojectmanager/autogenstep.cpp

@@ -90,7 +90,7 @@ Tasking::GroupItem AutogenStep::runRecipe()
         if (!m_runAutogen) {
             emit addOutput(Tr::tr("Configuration unchanged, skipping autogen step."),
                            OutputFormat::NormalMessage);
-            return SetupResult::StopWithDone;
+            return SetupResult::StopWithSuccess;
         }
         return SetupResult::Continue;
     };