agent2: Fix `test_save_load_thread` for Windows paths (#39753)

Use path! macro for platform-specific path formatting in test
assertions, fixing hardcoded Unix-style paths that failed on Windows.

Release Notes:

- N/A

Signed-off-by: Xiaobo Liu <cppcoffee@gmail.com>
71856706c7Xiaobo Liu committed on 10/8/2025, 10:47:43 AM· committed by GitHubparent4ec24eb
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