Add previous_execution_id field to DatasetRow/scenario

[devin-ai-integration]

Adds previous_execution_id field to DatasetRow (scenario) in the SDK, enabling users to reference a previous Workflow Execution for initial State loading. This field is now supported in both the Python SDK and the TypeScript codegen for round-trip serialization.

Updates since last revision:

• Wired previous_execution_id through WorkflowSandboxRunner.run() to workflow.stream(), so running a sandbox with a dataset row that includes previous_execution_id will now correctly load prior state
• Added test to verify WorkflowSandboxRunner passes previous_execution_id to the workflow stream

Review & Testing Checklist for Human

• Verify that running a sandbox with previous_execution_id actually loads state from the previous execution (the unit test only verifies the parameter is passed, not the end-to-end behavior)
• Confirm the TypeScript codegen generates valid Python code with previous_execution_id parameter

Notes

• Requested by: @vincent0426
• Session: https://app.devin.ai/sessions/0c1806467d8c4c4eb9eff89afa57518c

[devin-ai-integration]

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

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[dvargas92495]

@TirmanSidhu brought up an interesting point last week where we may be able to infer the previous_execution_id from just loading the latest execution from the sandbox for a given scenario. I'm starting to think we may want to hold off on merging this in the SDK-level/django-level, until we feel the need for persistence after implementing chat triggers from a frontend perspective