fix: task state from/to proto missing reject

[oneInsect]

Description

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @oneInsect, 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 addresses a bug where the rejected task state was not correctly handled during the bidirectional conversion between the application's internal TaskState representation and its Protobuf counterpart. By adding the necessary mapping for this state in both directions, the change ensures that the rejected status is accurately preserved when tasks are serialized to and deserialized from Protobuf messages, preventing potential data inconsistencies or incorrect state handling.

Highlights

• Task State Conversion: Added the missing rejected state to the conversion logic from the internal types.TaskState enum to the a2a_pb2.TaskState Protobuf enum.
• Task State Conversion: Implemented the reverse conversion for the rejected state, mapping a2a_pb2.TaskState.TASK_STATE_REJECTED back to types.TaskState.rejected.

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[gemini-code-assist]

Code Review

This pull request correctly adds the missing mapping for the rejected task state in both the ToProto.task_state and FromProto.task_state methods. The changes are straightforward and address the issue described. I've added a comment regarding updating the unit tests to cover this new case.

[gemini-code-assist]

This new case for types.TaskState.rejected is correct. To ensure this change is properly tested, please update the test_enum_conversions unit test in tests/utils/test_proto_utils.py. The test currently excludes types.TaskState.rejected from the round-trip conversion check. Please update the test to include this new state to ensure it's properly covered.

[holtskinner]

@oneInsect Please update the tests

[holtskinner]

Please check to ensure this isn't already covered in #572