{LYN-4372} fix for Python exit crash (#1600)

There is a crash when sys.exit() was being called since embedded Python
should not have control of the application lifetime. The Py_InspectFlag
puts the Python VM into 'inspection mode' which prevents the app
shutdown when any sys.exit() is invoked.

Notes:
* skips 'regset' extra command line in PythonBindingsExample
* added methods for handling PythonBindingsExample errors

Test: added Application_SystemExit_Blocked and
fixed up Application_Run_Fails now is Application_Run_Works

Code/Tools/PythonBindingsExample/source/ApplicationParameters.cpp

@@ -60,6 +60,10 @@ PythonBindingsExample.exe --file path/to/file.py --arg one --arg two
             {
                 m_interactiveMode = true;
             }
+            else if (switchItem.m_option.starts_with("regset"))
+            {
+                // skip
+            }
             else
             {
                 AZ_Warning("python_app", false, "Unknown switch %s \n", switchItem.m_option.c_str());