Select local / remote launch sounds like it actually launches the server

[IanMatthewHuff]

This was raised by @joelcthomas in issue microsoft/vscode-python#3794.

Currently our UI for selecting local server launch or remote launch makes it sound like we are actually going to launch the server right then. But we actually launch it when we next get a "run cell" command. We could used a re-phrase here to make this more clear.

"@IanMatthewHuff I thought after picking "Launch local Jupyter server", I would get a URL for Jupyter with token or so for me to use like (http://localhost:8888/?token=562560...) in a terminal or Output window. Or at least open an empty Python Interactive session. Many times, I just start prototyping from a notebook, so this would be helpful."