Translate workflow creation steps and Slack install changes to es/fr/zh

[mintlify]

Summary

Translates changes from PR #4489 (c70c6bf) to Spanish, French, and Chinese:

• Updated workflow creation steps (now 6 steps) with clearer descriptions of each configuration step
• Updated Slack notification note to reference the Mintlify Slack app specifically
• Simplified the Slack notification dashboard configuration steps

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Note

Low Risk
Low risk documentation-only changes affecting localized MDX content and UI wording, with no runtime or configuration logic changes.

Overview
Aligns es/agent/workflows.mdx, fr/agent/workflows.mdx, and zh/agent/workflows.mdx with the updated dashboard workflow creation flow by expanding and clarifying the steps (now 6 steps, including schedule/repos and automerge).

Updates Slack notification guidance to explicitly reference installing the Mintlify Slack app, and simplifies the dashboard setup instructions (install app, toggle Notify on completion, then pick channels).

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