yuhuchua-qti

[QNN EP] Adjust tolerance for Clip and Transpose tests due to FP16 default in QNN HTP

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### Description This PR updates the tolerance thresholds for the Clip and Transpose tests in QnnHTPBackendTests. The adjustment accounts for minor accuracy differences introduced by the change in default floating-point...

[QNN EP] Dump UT artifacts for debugging

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### Description This change introduces new environment variables to make debugging failed unit tests easier by saving input/output artifacts: - ORT_UNIT_TEST_DUMP_ARTIFACTS: Dumps inputs, outputs, and expected outputs for test cases....