fix: update event handling to support batch processing of FsEvents

[GiveMe-A-Name]

Summary

This PR refactors the file system event handling architecture to support batch processing of FsEvents.

The batch event will so fast consume if user setting watchOptions.aggregateTimeout as zero.

We should batch processing associated_event by trigger finding. Otherwise it will trigger twice callback.

Related links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for rspack canceled.

Name	Link
🔨 Latest commit	5859eaa
🔍 Latest deploy log	https://app.netlify.com/projects/rspack/deploys/68a82153eacb1c00082aa1f8

[Copilot]

Pull Request Overview

This PR updates the event handling system to support batch processing of file system events instead of processing them individually. The change modifies the channel communication to send vectors of FsEvent rather than single events.

• Changes event channels from UnboundedSender<FsEvent> to UnboundedSender<Vec<FsEvent>>
• Updates event processing logic to handle batched events
• Modifies test assertions to work with the new batched event structure

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
crates/rspack_fs/src/watcher/trigger.rs	Updates trigger to send batched events and refactors event processing logic
crates/rspack_fs/src/watcher/scanner.rs	Modifies scanner to send single events wrapped in vectors for consistency
crates/rspack_fs/src/watcher/executor.rs	Updates executor to receive and process batched events

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[github-actions]

📦 Binary Size-limit

Comparing 5859eaa to fix: check force_build_deps target module is isolated (#11461) by jinrui

❌ Size increased by 768bytes from 47.60MB to 47.61MB (⬆️0.00%)

[codspeed-hq]

CodSpeed Performance Report

Merging #11460 will not alter performance

_{Comparing fix/native-wacher-emit-redundancy-event (5859eaa) with main (5cd6aaa)¹}

🎉 Hooray! codspeed-rust just leveled up to 2.7.2!

A heads-up, this is a breaking change and it might affect your current performance baseline a bit. But here's the exciting part - it's packed with new, cool features and promises improved result stability 🥳!
Curious about what's new? Visit our releases page to delve into all the awesome details about this new version.

Summary

✅ 17 untouched benchmarks

Footnotes

1. No successful run was found on main (eb0352a) during the generation of this report, so 5cd6aaa was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩