Option to not receive extension updates

[ramya-rao-a]

Related to #54354

With the addition of this setting, user can choose not to receive extension updates, thus enabling the last piece of the offline mode story.

@joaomoreno The corresponding setting for VS Code updates is the update.channel. What was the reason to have this setting take an enum of default and none instead of a boolean?

[joaomoreno]

update.channel is a very old setting. We should've done a boolean from the get-go but a lot of users already had it set to none, so we decided to go with this instead.

I'm confused by this setting... I think the expression receive updates doesn't do it justice. Should it maybe be extensions will not be updated instead? Or rather VS Code will not check for extension updates.

[sandy081]

Why not having a single switch for offline mode and others react based on it instead of having settings for each? If we want per component, then we can extend the offline setting to define per componenet.

[ramya-rao-a]

Good point, updated #54354 accordingly.