Make max_submit_count configurable via Config

[kazuhisa-wada]

Summary

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Mage max_submit_count configurable via Config. This is the action for langgenius#11668

Screenshots

Before
please see screenshots in langgenius#11668

After

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

For test code, I haven't added any test code for this as this change is limited to parameter related to limits.
For document, there is no document to be changed.
For dev/reformat, I ran it as follows: