fix(node/perf_hooks): stub eventLoopUtilization (#24501)

This PR stubs `perf_hooks.eventLoopUtilization` to make the tests of
[hapi](https://github.com/hapijs/hapi) start. Previously, they'd all
error because of this function throwing a not implemented error. This
brings down the test failures in their suite from 982 to 68 failures.

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/unit_node/perf_hooks_test.ts b/tests/unit_node/perf_hooks_test.ts
index 86c4aee4c..1b066a42b 100644
--- a/tests/unit_node/perf_hooks_test.ts
+++ b/tests/unit_node/perf_hooks_test.ts
@@ -61,3 +61,10 @@ Deno.test({
     });
   },
 });
+
+Deno.test("[perf_hooks]: eventLoopUtilization", () => {
+  const obj = performance.eventLoopUtilization();
+  assertEquals(typeof obj.idle, "number");
+  assertEquals(typeof obj.active, "number");
+  assertEquals(typeof obj.utilization, "number");
+});