feat: add previous_response_id parameter to OpenAI module

[chakrris]

Summary

Add support for previous_response_id parameter to all OpenAI module run methods, following the same implementation pattern as the existing max_turns parameter from commit 564bedd.

Changes

• OpenAI Module: Added previous_response_id: str | None = None parameter to all 4 run methods (run_agent, run_agent_auto_send, run_agent_streamed, run_agent_streamed_auto_send)
• Parameter Classes: Added parameter to RunAgentParams base class, automatically inheriting to all derived classes
• Service Layer: Implemented conditional logic to handle all combinations of max_turns and previous_response_id parameters
• Activity Methods: Updated all activity methods to pass the parameter through to service calls
• Unit Tests: Added comprehensive parametrized test test_run_agent_previous_response_id to verify parameter behavior

Implementation Details

The parameter flows through the following architectural layers:

OpenAI Module → Temporal Activity → OpenAI Service → Runner.run

The service layer uses smart conditional logic to handle all parameter combinations:

• Both parameters provided: Pass both to Runner.run
• Only max_turns: Pass only max_turns
• Only previous_response_id: Pass only previous_response_id
• Neither provided: Call Runner.run with no optional parameters

Test Coverage

• ✅ All existing tests continue to pass (15/15)
• ✅ New unit test verifies parameter is passed when provided and omitted when None
• ✅ Parametrized test covers both scenarios with mock verification

Backward Compatibility

This change is fully backward compatible - the parameter defaults to None and existing code will continue to work unchanged.