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/project/src/project_settings.rs

@@ -188,9 +188,9 @@ pub struct DiagnosticsSettings {
 
 impl DiagnosticsSettings {
     pub fn fetch_cargo_diagnostics(&self) -> bool {
-        self.cargo.as_ref().map_or(false, |cargo_diagnostics| {
-            cargo_diagnostics.fetch_cargo_diagnostics
-        })
+        self.cargo
+            .as_ref()
+            .is_some_and(|cargo_diagnostics| cargo_diagnostics.fetch_cargo_diagnostics)
     }
 }