Settings refactor (#38367)

Co-Authored-By: Ben K <ben@zed.dev>
Co-Authored-By: Anthony <anthony@zed.dev>
Co-Authored-By: Mikayla <mikayla@zed.dev>

Release Notes:

- settings: Major internal changes to settings. The primary user-facing
effect is that some settings which did not make sense in project
settings files are no-longer read from there. (For example the inline
blame settings)

---------

Co-authored-by: Ben Kunkle <ben@zed.dev>
Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>
Co-authored-by: Anthony <anthony@zed.dev>

crates/eval/src/eval.rs

@@ -340,10 +340,7 @@ pub fn init(cx: &mut App) -> Arc<AgentAppState> {
     release_channel::init(app_version, cx);
     gpui_tokio::init(cx);
 
-    let mut settings_store = SettingsStore::new(cx);
-    settings_store
-        .set_default_settings(settings::default_settings().as_ref(), cx)
-        .unwrap();
+    let settings_store = SettingsStore::new(cx, &settings::default_settings());
     cx.set_global(settings_store);
     client::init_settings(cx);