perf: improve async op santizer speed and accuracy (#20501)

This commit improves async op sanitizer speed by only delaying metrics
collection if there are pending ops. This
results in a speedup of around 30% for small CPU bound unit tests.

It performs this check and possible delay on every collection now,
fixing an issue with parent test leaks into steps.

2 files changed, 20 insertions, 0 deletions

diff --git a/cli/tests/testdata/test/ops_sanitizer_step_leak.out b/cli/tests/testdata/test/ops_sanitizer_step_leak.out
new file mode 100644
index 000000000..296c5e573
--- /dev/null
+++ b/cli/tests/testdata/test/ops_sanitizer_step_leak.out
@@ -0,0 +1,10 @@
+Check [WILDCARD]/cli/tests/testdata/test/ops_sanitizer_step_leak.ts
+running 1 test from ./cli/tests/testdata/test/ops_sanitizer_step_leak.ts
+timeout ...
+  step ... ok [WILDCARD]
+------- output -------
+done
+----- output end -----
+timeout ... ok [WILDCARD]
+
+ok | 1 passed (1 step) | 0 failed [WILDCARD]
\ No newline at end of file
diff --git a/cli/tests/testdata/test/ops_sanitizer_step_leak.ts b/cli/tests/testdata/test/ops_sanitizer_step_leak.ts
new file mode 100644
index 000000000..3fb9b397e
--- /dev/null
+++ b/cli/tests/testdata/test/ops_sanitizer_step_leak.ts
@@ -0,0 +1,10 @@
+Deno.test("timeout", async (t) => {
+  const timer = setTimeout(() => {
+    console.log("timeout");
+  }, 10000);
+  clearTimeout(timer);
+  await t.step("step", async () => {
+    await new Promise<void>((resolve) => setTimeout(() => resolve(), 10));
+  });
+  console.log("done");
+});