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.cpp

@@ -246,9 +246,11 @@ namespace O3DE::ProjectManager
         if (Py_IsInitialized())
         {
             AZ_Warning("python", false, "Python is already active");
-            return false;
+            return m_pythonStarted;
         }
 
+        m_pythonStarted = false;
+
         // set PYTHON_HOME
         AZStd::string pyBasePath = Platform::GetPythonHomePath(PY_PACKAGE, m_enginePath.c_str());
         if (!AZ::IO::SystemFile::Exists(pyBasePath.c_str()))
@@ -304,7 +306,8 @@ namespace O3DE::ProjectManager
             // make sure the engine is registered
             RegisterThisEngine();
 
-            return !PyErr_Occurred();
+            m_pythonStarted = !PyErr_Occurred();
+            return m_pythonStarted;
         }
         catch ([[maybe_unused]] const std::exception& e)
         {