fix: Incorrect iteration log display in workflow with multiple parallel mode iteartaion nodes

[Nov1c444]

Incorrect iteration log display in workflow with multiple parallel mode iteartaion nodes

Summary

When there are two or more iteration nodes in the workflow, the logs for iteration nodes other than the first one will be incorrect because the state for each iteration node was not categorized correctly before. This issue has now been resolved.

Fixes #11117

Screenshots

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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