Another batch of lint fixes (#36521)

- **Enable a bunch of extra lints**
- **First batch of fixes**
- **More fixes**

Release Notes:

- N/A

crates/assistant_tools/src/assistant_tools.rs

@@ -72,11 +72,10 @@ pub fn init(http_client: Arc<HttpClientWithUrl>, cx: &mut App) {
     register_web_search_tool(&LanguageModelRegistry::global(cx), cx);
     cx.subscribe(
         &LanguageModelRegistry::global(cx),
-        move |registry, event, cx| match event {
-            language_model::Event::DefaultModelChanged => {
+        move |registry, event, cx| {
+            if let language_model::Event::DefaultModelChanged = event {
                 register_web_search_tool(&registry, cx);
             }
-            _ => {}
         },
     )
     .detach();