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/assistant_context/src/context_store.rs

@@ -789,7 +789,7 @@ impl ContextStore {
         let fs = self.fs.clone();
         cx.spawn(async move |this, cx| {
             pub static ZED_STATELESS: LazyLock<bool> =
-                LazyLock::new(|| std::env::var("ZED_STATELESS").map_or(false, |v| !v.is_empty()));
+                LazyLock::new(|| std::env::var("ZED_STATELESS").is_ok_and(|v| !v.is_empty()));
             if *ZED_STATELESS {
                 return Ok(());
             }