chore: Fix nightly lints (#12746)

- Remove some unused code
- Use `is_multiple_of()` instead of '%'
- Collapse consecuative "if let" statements
- Elided lifetime fixes

It is enough just to review the code of your team

libs/tracing-utils/src/perf_span.rs

@@ -49,7 +49,7 @@ impl PerfSpan {
         }
     }
 
-    pub fn enter(&self) -> PerfSpanEntered {
+    pub fn enter(&self) -> PerfSpanEntered<'_> {
         if let Some(ref id) = self.inner.id() {
             self.dispatch.enter(id);
         }