meta(gitignore): Ignore user-specific VSCode settings (#54036)
VSCode has two mechanisms for pulling in repository-local settings,
which are applied on top of the global user settings.json: a
settings.json file in the /.vscode directory, and a .code-workspace file
at the root of the repository. We already track the first of these in
git, to enforce some team-scope settings for all users of the
repository. This change adds the second method, .code-workspace, to the
.gitignore list, allowing users to change their settings if they have a
very compelling reason (ex, VSCode running the formatter very slowly,
which is what prompted this change).
Alex Zaslavsky