fix(ext/node): attach addAbortListener to EventEmitter, fix errorMonitor - #34262

…tor (denoland#34262)

`require("node:events").addAbortListener` was `undefined`, so libraries
that hit the CJS path (notably undici 8.x used by `npm:undici`) crashed
with `addAbortListenerNative is not a function`. Node attaches every
named export as a static property on the `EventEmitter` constructor, and
that's also what the ESM default export points at; Deno did this for
most properties but had never assigned `EventEmitter.addAbortListener`,
so both the CJS export and `import events from "node:events"` were
missing it.

The same file also captured the local `errorMonitor` binding before
`EventEmitter.errorMonitor = kErrorMonitor` ran, so the named export and
the namespace import resolved to `undefined` even though the property
on the constructor itself was correct. Both bindings now read from
`kErrorMonitor` directly.

Fixes denoland#34261