Automate settings registration (#42238)

Release Notes:

- N/A

---------

Co-authored-by: Nia <nia@zed.dev>

crates/git_ui/src/project_diff.rs

@@ -1587,9 +1587,6 @@ mod tests {
             let store = SettingsStore::test(cx);
             cx.set_global(store);
             theme::init(theme::LoadThemes::JustBase, cx);
-            language::init(cx);
-            Project::init_settings(cx);
-            workspace::init_settings(cx);
             editor::init(cx);
             crate::init(cx);
         });