Avoid generating singular matrices in TestLuFactor/TestLuFactorBatched (#2599)

This PR suggests adding `_make_nonsingular_np` and
``_make_nonsingular_nd_np functions to `TestLuFactor` and
`TestLuFactorBatched` to ensure the generation of non-singular matrices
and avoid warnings in test log 6711bbd

Author: github-actions[bot]

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