QmlDesigner: Track if QDS was opened from QtC

Task-number: QDS-6315
Change-Id: I4109e9c98ff5c27b4096b1af32ae945aec10c123
Reviewed-by: Henning Gründl <henning.gruendl@qt.io>

src/plugins/qmlprojectmanager/qmlproject.h

@@ -147,6 +147,7 @@ public:
     ProjectExplorer::Tasks projectIssues(const ProjectExplorer::Kit *k) const final;
 
     static bool isQtDesignStudio();
+    static bool isQtDesignStudioStartedFromQtC();
 
     bool isEditModePreferred() const override;