[enhance] Workflow Saving Update Existing md Files

[hesamsheikh]

Description

Fixes #3377
If the new process is similar to the workflow process, update it instead of creating new ones. this helps maintain the number of workflow memories.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch workflow-dynamic-save

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