Fix newline characters in tables during document parsing

[Hisir0909]

Summary

This commit addresses an issue where newline characters within table cells were causing incorrect formatting and table misalignment during document parsing.

The fix ensures that newline characters within table cells are properly handled, allowing the table to maintain its intended structure and position in the parsed text. This improves the accuracy and readability of the parsed documents.

Tip

Close issue syntax: Fixes #<issue number> or Resolves #<issue number>, see documentation for more details.

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Checklist

Important

Please review the checklist below before submitting your pull request.

• 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 dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[Hisir0909]

Here are additions to this #11879

[yihong0618]

you can run the mypy in your local env.

cd api
(source env)
python -m mypy .

and need to install all the type package

mine is like this(use uv)

uv pip install  types-Flask-Cors types-Flask-Migrate types-PyYAML types-beautifulsoup4 types-openpyxl types-psycopg2 types-regex

[Hisir0909]

you can run the mypy in your local env.

cd api (source env) python -m mypy .

and need to install all the type package

mine is like this(use uv)

uv pip install  types-Flask-Cors types-Flask-Migrate types-PyYAML types-beautifulsoup4 types-openpyxl types-psycopg2 types-regex

thanks！！