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/repl/src/components/kernel_options.rs

@@ -126,7 +126,7 @@ impl PickerDelegate for KernelPickerDelegate {
                 .collect()
         };
 
-        return Task::ready(());
+        Task::ready(())
     }
 
     fn confirm(&mut self, _secondary: bool, window: &mut Window, cx: &mut Context<Picker<Self>>) {

crates/repl/src/repl_editor.rs

@@ -434,7 +434,7 @@ fn runnable_ranges(
 
     if start_language
         .zip(end_language)
-        .map_or(false, |(start, end)| start == end)
+        .is_some_and(|(start, end)| start == end)
     {
         (vec![snippet_range], None)
     } else {