Automate settings registration (#42238)

Release Notes:

- N/A

---------

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

crates/agent_ui/src/agent_diff.rs

@@ -1717,12 +1717,11 @@ mod tests {
     use super::*;
     use crate::Keep;
     use acp_thread::AgentConnection as _;
-    use agent_settings::AgentSettings;
     use editor::EditorSettings;
     use gpui::{TestAppContext, UpdateGlobal, VisualTestContext};
     use project::{FakeFs, Project};
     use serde_json::json;
-    use settings::{Settings, SettingsStore};
+    use settings::SettingsStore;
     use std::{path::Path, rc::Rc};
     use util::path;
 
@@ -1731,13 +1730,8 @@ mod tests {
         cx.update(|cx| {
             let settings_store = SettingsStore::test(cx);
             cx.set_global(settings_store);
-            language::init(cx);
-            Project::init_settings(cx);
-            AgentSettings::register(cx);
             prompt_store::init(cx);
-            workspace::init_settings(cx);
             theme::init(theme::LoadThemes::JustBase, cx);
-            EditorSettings::register(cx);
             language_model::init_settings(cx);
         });
 
@@ -1890,13 +1884,8 @@ mod tests {
         cx.update(|cx| {
             let settings_store = SettingsStore::test(cx);
             cx.set_global(settings_store);
-            language::init(cx);
-            Project::init_settings(cx);
-            AgentSettings::register(cx);
             prompt_store::init(cx);
-            workspace::init_settings(cx);
             theme::init(theme::LoadThemes::JustBase, cx);
-            EditorSettings::register(cx);
             language_model::init_settings(cx);
             workspace::register_project_item::<Editor>(cx);
         });