Fix a bunch of other low-hanging style lints (#36498)

- **Fix a bunch of low hanging style lints like unnecessary-return**
- **Fix single worktree violation**
- **And the rest**

Release Notes:

- N/A

crates/gpui/src/platform.rs

@@ -592,7 +592,7 @@ impl PlatformTextSystem for NoopTextSystem {
     }
 
     fn font_id(&self, _descriptor: &Font) -> Result<FontId> {
-        return Ok(FontId(1));
+        Ok(FontId(1))
     }
 
     fn font_metrics(&self, _font_id: FontId) -> FontMetrics {