Add #[must_use] to is_condition tests

A continuation of #89718.

library/std/src/sync/barrier.rs

@@ -167,6 +167,7 @@ impl BarrierWaitResult {
     /// println!("{:?}", barrier_wait_result.is_leader());
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     pub fn is_leader(&self) -> bool {
         self.0
     }