Summary of Changes

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This pull request primarily focuses on enhancing the testing coverage for asynchronous object reading functionalities, particularly when dealing with read_handles. It introduces new system and unit tests to ensure that objects can be reliably opened and downloaded using a read_handle, which is crucial for resuming downloads or sharing read states. Minor code adjustments were made to support these tests and improve the robustness of stream handling.

Highlights

• System Test for read_handle: Introduced a new system test (test_mrd_open_with_read_handle) to validate the functionality of opening an AsyncMultiRangeDownloader using a read_handle. This test ensures that an object can be downloaded correctly after being opened with a previously obtained handle.
• Unit Test for read_handle: Added a unit test (test_open_with_read_handle) for _AsyncReadObjectStream to specifically verify its behavior when initialized and opened with a read_handle, including checks for generation_number and persisted_size.
• _AsyncReadObjectStream Initialization Refinement: The initialization of first_bidi_read_req in _AsyncReadObjectStream has been moved from __init__ to the open method, allowing the read_handle to be dynamically included in the request.
• Robust Metadata Access: Improved the robustness of metadata access in _AsyncReadObjectStream.open() by adding a hasattr check before accessing response.metadata, preventing potential attribute errors.
• Resource Cleanup: Added self.read_obj_str = None in AsyncMultiRangeDownloader.close() to explicitly clear the reference to the underlying stream, aiding in resource management.

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/gcbrun

/gcbrun(880787f)

Please fix failing checks

Please fix failing checks

Samples - Python 3.14 is blocked , others passed.