Improve Windows update experience

[joaomoreno]

[mikemaccana]

There's no details here, but presumably this is to speed up the update time? It would be great for vscode to say 'restart to update' and it just restarts with the new version running, more like Chrome, less like
the current 90s-style installshield-type thing.

[joaomoreno]

@mikemaccana It'll come close to that. 👍

[mikemaccana]

@joaomoreno Cool and thanks!