Promote previously python-specific InterpreterAspect

... and drop PythonRunConfiguration, which is a plain RunConfiguration now.

Change-Id: I540cb738180fc1424f730d6d1998886915ce527b
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/python/pythonlanguageclient.cpp

@@ -56,6 +56,7 @@
 #include <QTimer>
 
 using namespace LanguageClient;
+using namespace ProjectExplorer;
 using namespace Utils;
 
 namespace Python {