feat(agents-api): Add label lookup for inputs and outputs

[Ahmad-mtos]

closes #791

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Important

Add label lookup for inputs and outputs in agents API by updating StepContext and workflow execution methods.

• Behavior:
  • Add labels attribute to StepContext in tasks.py for label lookup in inputs and outputs.
  • Update prepare_for_step in tasks.py to merge labels with inputs and outputs.
• Workflow Execution:
  • Modify run method in __init__.py to handle previous_labels for task execution.
  • Update continue_as_child in helpers.py to accept previous_labels parameter.

^{This description was created by for 9a3cfd0. It will automatically update as commits are pushed.}

[ellipsis-dev]

❌ Changes requested. Reviewed everything up to 9a3cfd0 in 41 seconds

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• Looked at 102 lines of code in 3 files
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1. agents-api/agents_api/workflows/task_execution/__init__.py:140

• Draft comment:
  Initializing previous_labels as an empty dictionary if not provided is consistent with the changes for label lookup. This logic is correct.
• Reason this comment was not posted:
  Confidence changes required: 0%
  The run method in TaskExecutionWorkflow class initializes previous_labels as an empty dictionary if not provided. This is consistent with the changes made to support label lookup for inputs and outputs. The logic seems correct here.

Workflow ID: wflow_iVQFZayAMbHKoGjo

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