Show warning that python isnt installed in select interpreter and/or create environment quick pick

[cwebster-99]

Observed a user navigate to the Select Interpreter status bar item when a python wasnt select and they were shown Create Environment and Enter Interpreter path.

I dont think we should show Create Environment here unless one of the supported managers has a way to bring a Python in the process. It would be nice to also have a warning in this drop down that Python is not detected. Users got stuck in this process and just trying to create environments over and over again