Auto merge of #23139 - gterzian:bounded_profiler_with_buffer_feedback, r=jdm

Bound sampler buffer, add length feedback message, fix intermittence in test

<!-- Please describe your changes on the following line: -->

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [ ] `./mach build -d` does not report any errors
- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix #23109 (GitHub issue number if applicable)

<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because ___

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/23139)
<!-- Reviewable:end -->

components/background_hang_monitor/tests/hang_monitor_tests.rs

@@ -40,11 +40,15 @@ fn test_sampler() {
     );
 
     const RATE: u64 = 10;
+    const MAX_DURATION: u64 = 10;
     sampler_sender
-        .send(SamplerControlMsg::Enable(Duration::from_millis(RATE)))
+        .send(SamplerControlMsg::Enable(
+            Duration::from_millis(RATE),
+            Duration::from_secs(MAX_DURATION),
+        ))
         .unwrap();
 
-    thread::sleep(Duration::from_millis(30));
+    thread::sleep(Duration::from_millis(100));
 
     sampler_sender.send(SamplerControlMsg::Disable).unwrap();