chore(workflow): remove ecosystem CI lark alert

[chenjiahan]

Summary

Remove the ecosystem CI failure notification (lark alert), as this notification is no longer used.

Checklist

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

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[Copilot]

Pull Request Overview

Remove the unused Lark alert script and its invocation in the ecosystem CI workflow, as failure notifications are no longer sent.

• Delete scripts/alert/lark.js (unused notification helper)
• Remove the “Send Failure Notification” step from .github/workflows/ecosystem-ci.yml

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
scripts/alert/lark.js	Entire file removed since Lark alerts are unused
.github/workflows/ecosystem-ci.yml	Removed CI step that ran the Lark alert script