Enable clippy::needless_lifetimes (#8777)

This PR enables the
[`clippy::needless_lifetimes`](https://rust-lang.github.io/rust-clippy/master/index.html#/needless_lifetimes)
rule and fixes the outstanding violations.

Release Notes:

- N/A

crates/zed/src/zed.rs

@@ -2845,10 +2845,10 @@ mod tests {
         ))
     }
     #[track_caller]
-    fn assert_key_bindings_for<'a>(
+    fn assert_key_bindings_for(
         window: AnyWindowHandle,
         cx: &TestAppContext,
-        actions: Vec<(&'static str, &'a dyn Action)>,
+        actions: Vec<(&'static str, &dyn Action)>,
         line: u32,
     ) {
         let available_actions = cx