Don't show deprecated preferences in the UI

[colin-grant-work]

What it does

Fixes #11242 by hiding deprecated settings in the preferences UI.

How to test

1. Open the preferences UI
2. Search for a deprecated preference (e.g. editor.gotoLocation.multiple)
3. Observe that it does not appear in the UI.
4. Open a settings.json file.
5. Add a setting for a deprecated preference (e.g. "editor.gotoLocation.multiple" : null)
6. Observe that the line is marked with a warning decoration and on hover a message is displayed about the setting's deprecation.

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[vince-fugnitto]

LGTM 👍

I confirmed it works well, preferences that are marked as disabled (ex: json.colorDecorators.enable) do not show up in the view. If such a preference is actually added manually in the settings.json then it is correctly marked as deprecated.