chore: fix clippy lints to green the lint CI

- import.rs / promotion.rs: sort_by(|a,b| b.k.cmp(&a.k)) -> sort_by_key(Reverse(k))
- pipeline.rs: skip_while(!p).next() -> find(p)
Behaviour-preserving; completes the CI fix started by the cargo fmt commit.

src/import.rs

@@ -184,7 +184,7 @@ impl JobStore {
     }
     pub fn list(&self) -> Vec<Job> {
         let mut v: Vec<Job> = self.jobs.lock().unwrap().values().cloned().collect();
-        v.sort_by(|a, b| b.started.cmp(&a.started));
+        v.sort_by_key(|x| std::cmp::Reverse(x.started));
         v.truncate(20);
         v
     }