fix(web): support punctuation in markdown form field names (#38651)

[JzoNgKVO]

Summary

Fix ticket 2944 (Linear CUS-1392)
(cherry picked from commit 3c8e0e2)

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods