python extension asks to restart the extension host

[DonJayamanne]

Installing Python extension in dev container results in user being prompted to reload VS Code.

https://github.com/microsoft/vscode-copilot/issues/14034

[DonJayamanne]

The reason is as follows

• Stable version of Python ext is already installed
• Open VS Code insiders
• When using Kernel picker to install recommended extensions Python + Jupyter, then we end up installing pre-release versions of Python & Jupyter extension.
• In remote when ever we update/install a new version of an extension, we cannot just restart extension host, we must reload the window.

Solutions

• If extension is already installed, there's no need to change the flavour of install from stable -> pre-release & vice versa.
  This way we do not switch from stable to pre-release version of Python extension.
• Given this prompt is harmless in the context of Python, we could do nothing at all, (but could be misleading to users)