ProjectExplorer: declare only relevant aspects as features

This will disable python kits for all Wizards that require a valid Qt.

Change-Id: I4a8d6dd60629ddb556e49c067200acba8ef080d2
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/python/pythonkitaspect.cpp

@@ -147,7 +147,7 @@ public:
 
     QSet<Id> availableFeatures(const Kit *k) const override
     {
-        if (k->isAspectRelevant(PythonKitAspect::id()) && PythonKitAspect::python(k))
+        if (PythonKitAspect::python(k))
             return {PythonKitAspect::id()};
         return {};
     }