viable/strict/1789195030: Make test_aoti_observer's failure path actually fail (#195088)

发生了什么

test_aoti_observer's failure path omitted a constant, but w_pre/w_add are TensorConstants, which assert_all_constants only warns about and skips - so the update never failed. Use a kMeta-device tensor instead, which fails the device check regardless of whether the build is CPU or CUDA. Pull Request resolved: #195088 Approved by: https://github.com/desertfire

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