fix workflow variable split judge.

[zhanluxianshen]

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Summary

Fix #26354

Screenshots

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

[gemini-code-assist]

Summary of Changes

Hello @zhanluxianshen, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a bug in the workflow variable loading mechanism by enhancing the validation of variable keys. The change ensures that any variable key, when parsed, must consist of at least two parts (e.g., 'node.variable'), preventing malformed keys from being processed and improving the overall robustness of the workflow system.

Highlights

• Workflow Variable Validation: Corrected the validation logic for workflow variable keys to ensure they adhere to the expected format, requiring at least two segments when split by a dot.
• Bug Fix: Addressed issue [Chore/Refactor] fix workflow variable split judge. #26354 by refining the condition that checks the length of node_variable_list after splitting a variable key.

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[gemini-code-assist]

Code Review

This pull request correctly adjusts the logic for splitting workflow variable keys, enforcing that a key must contain at least two parts. However, this change introduces an inconsistency with the associated error message, which I've flagged in a review comment with a suggested fix. Additionally, a code comment indicates this logic should be synchronized with the WorkflowEntry.mapping_user_inputs_to_variable_pool function, but that function has not been updated in this PR. This could lead to divergent behavior and may need to be addressed for consistency.