Translate Slack notification docs for workflows

[mintlify]

Summary

• Added translations for the new Slack notifications section in agent/workflows.mdx to Spanish, French, and Chinese
• Added the notify field to the frontmatter fields table in all three languages
• Added the "Changelog with notifications" example workflow to all translations

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Note

Low Risk
Low risk documentation-only change: updates localized workflows.mdx content to document the new notify Slack notification configuration and example workflow.

Overview
Adds Spanish, French, and Chinese documentation updates for workflow Slack notifications: introduces the notify frontmatter field, documents recipient options (channels/users by name or ID) and Slack integration requirement, and adds a “changelog with notifications” example workflow using notify.slack.

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