test: stabilize async watch event correlation

[chenjiahan]

This PR stabilizes watch-mode e2e coverage when a newer compilation supersedes an in-flight async type check.

The recorder now aggregates file changes across superseded compilations and waits for build and issue events from the same compilation, avoiding permanent waits on diagnostics that are intentionally discarded.

Related Links

• https://github.com/rstackjs/ts-checker-rspack-plugin/actions/runs/30238469327/job/89890693662

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 5bd9109a-e55c-4aeb-ab4e-77a11146bdab

📥 Commits

Reviewing files that changed from the base of the PR and between 597fcfd and 5109a17.

📒 Files selected for processing (2)

• test/e2e/helpers/rspack.ts
• test/e2e/with-rspack/watch.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenjiahan/fix-flaky-watch-event-correlation

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