VSCode settings import refactor (#40513)

A small follow-up to the settings refactor of a few weeks ago to move
all the VSCode settings imports
to one place.

This should make it easier to spot missing imports, and easier to test
the importer.

Release Notes:

- N/A

crates/zlog_settings/src/zlog_settings.rs

@@ -29,6 +29,4 @@ impl Settings for ZlogSettings {
             scopes: content.log.clone().unwrap(),
         }
     }
-
-    fn import_from_vscode(_: &settings::VsCodeSettings, _: &mut settings::SettingsContent) {}
 }