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/recent_projects/src/recent_projects.rs

@@ -700,7 +700,7 @@ mod tests {
     use dap::debugger_settings::DebuggerSettings;
     use editor::Editor;
     use gpui::{TestAppContext, UpdateGlobal, WindowHandle};
-    use project::{Project, project_settings::ProjectSettings};
+    use project::Project;
     use serde_json::json;
     use settings::SettingsStore;
     use util::path;
@@ -714,8 +714,11 @@ mod tests {
 
         cx.update(|cx| {
             SettingsStore::update_global(cx, |store, cx| {
-                store.update_user_settings::<ProjectSettings>(cx, |settings| {
-                    settings.session.restore_unsaved_buffers = false
+                store.update_user_settings(cx, |settings| {
+                    settings
+                        .session
+                        .get_or_insert_default()
+                        .restore_unsaved_buffers = Some(false)
                 });
             });
         });