IntelPython / dpnp / 23295526851

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Update QR tests to avoid element-wise comparisons (#2785)

This PR proposes updating QR tests to avoid direct element-wise
comparisons which became unstable with oneMKL 2026.0 due to sign and
phase differences in otherwise valid QR results

Since QR factorization is not unique, different MKL and NumPy versions
may return results that differ by sign or complex phase while still
representing a correct decomposition

To make the tests more stable this PR proposes using invariant-based
validation for `mode="raw"` and `mode="r"` based on the unitarity of the
Q factor (Q^H Q = I) and the resulting QR identity
R^H @ R = A^H @ A

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