refactor(graph_engine): move observability layer and persistence laye…

[laipz8200]

…r to core.app.workflow

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Summary

fixes #31610

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 make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @laipz8200, 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 refactors the project structure by relocating the observability and persistence layers to a more appropriate directory within the core/app/workflow structure. This change improves code organization and maintainability by grouping workflow-related components together. The update also involves adjusting import statements in the affected files to ensure that the application correctly references the relocated layers.

Highlights

• Refactoring: Moves the observability and persistence layers from core.workflow.graph_engine.layers to core.app.workflow.layers.
• Import Adjustments: Updates import statements across several files to reflect the new location of the observability and persistence layers.
• Code Consistency: Ensures that the application's workflow components correctly reference the relocated layers.

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[gemini-code-assist]

Code Review

This pull request successfully refactors the project structure by moving the observability and persistence layers from core.workflow.graph_engine.layers to core.app.workflow.layers. The changes are consistently applied across all affected files, including import statements in application runners, the workflow_entry module, and unit tests. The .importlinter configuration has also been updated to reflect these new module paths. The refactoring appears to be thorough and correctly implemented, maintaining the existing functionality while improving modularity.