If Language Server fails to activate we need to revert to Jedi (after displaying a message to the user).
Else user is unable to use the extension.

Right now we let the extension fall over.

• Handle a 404 when trying to download the language server
  Handle a 404 when trying to download the language server #3267
• Notify the user when language server extraction fails Notify the user when language server extraction fails #3268

Display the following message is LS fails to start: "We encountered an issue starting the Language Server. Reverting to the alternative, Jedi. Check the Output panel for details."
No buttons on this message.