Run get_python script when Python fails to load (#4482)

Signed-off-by: AMZN-alexpete <26804013+AMZN-alexpete@users.noreply.github.com>

Code/Tools/ProjectManager/Source/PythonBindings.h

@@ -31,6 +31,7 @@ namespace O3DE::ProjectManager
 
         // PythonBindings overrides
         bool PythonStarted() override;
+        bool StartPython() override;
 
         // Engine
         AZ::Outcome<EngineInfo> GetEngineInfo() override;
@@ -70,7 +71,6 @@ namespace O3DE::ProjectManager
         ProjectInfo ProjectInfoFromPath(pybind11::handle path);
         ProjectTemplateInfo ProjectTemplateInfoFromPath(pybind11::handle path, pybind11::handle pyProjectPath);
         bool RegisterThisEngine();
-        bool StartPython();
         bool StopPython();