feat: use Node.js timers by default (#33118)
## Summary
- Switches global
`setTimeout`/`setInterval`/`clearTimeout`/`clearInterval` to use Node.js
timer APIs instead of Web APIs by default
- Timer IDs are now `Timeout` objects instead of numbers (Node.js
`Timeout` has `[Symbol.toPrimitive]` so numeric coercion still works)
- The `--unstable-node-globals` flag is no longer needed for this
behavior
- Updates `unrefTimer`/`refTimer` in `ext/web/02_timers.js` to handle
both numeric IDs and Timeout objects
Re-land of
https://github.com/denoland/deno/commit/7ada8d6589de7e237b7af42dd666105a4386f206
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
