feat: "rejectionhandled" Web event and "rejectionHandled" Node event (#21875)

This commit adds support for "rejectionhandled" Web Event and
"rejectionHandled" Node event.

```js
import process from "node:process";

process.on("rejectionHandled", (promise) => {
  console.log("rejectionHandled", reason, promise);
});

window.addEventListener("rejectionhandled", (event) => {
  console.log("rejectionhandled", event.reason, event.promise);
});
```

---------

Co-authored-by: Matt Mastracci <matthew@mastracci.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/cli/tests/integration/node_unit_tests.rs b/cli/tests/integration/node_unit_tests.rs
index 273066b09..351bf1eec 100644
--- a/cli/tests/integration/node_unit_tests.rs
+++ b/cli/tests/integration/node_unit_tests.rs
@@ -193,3 +193,12 @@ itest!(unhandled_rejection_web_process {
   envs: env_vars_for_npm_tests(),
   http_server: true,
 });
+
+// Ensure that Web `onrejectionhandled` is fired before
+// Node's `process.on('rejectionHandled')`.
+itest!(rejection_handled_web_process {
+  args: "run -A node/rejection_handled_web_process.ts",
+  output: "node/rejection_handled_web_process.ts.out",
+  envs: env_vars_for_npm_tests(),
+  http_server: true,
+});