McuSupport: Move kit methods out of McuSupportOptions

... and into McuKitManager

Task-number: QTCREATORBUG-26890
Change-Id: Ic5ed689458d3ef004ebb42a549c48a6326c2f45d
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/mcusupport/mcupackage.h

@@ -86,10 +86,6 @@ public:
 
     const QString &environmentVariableName() const override;
 
-signals:
-    void changed();
-    void statusChanged();
-
 private:
     void updatePath();
     void updateStatusUi();