Explicit shape comparison for dpnp and numpy outputs (#2295)

In the test suite, the result arrays from `dpnp` and `numpy` were
compared, but their shapes were not explicitly checked for equality. As
a result, tests could pass even if the shapes differed, such as one
being `(1,)` and the other `()`.

This PR adds an explicit check to ensure that the output shapes of
`numpy` and `dpnp` match. Additionally, tests have been updated
accordingly to pass with this new check. e41ff80

Author: github-actions[bot]

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