Fix FreeU tests

[DN6]

What does this PR do?

FreeU tests in the common pipeline tests expect numpy arrays when running comparisons. Some of our pipeline tests return torch tensors are as output type which is causing these tests to fail. This PR

1. Changes the freeU tests to always set the output type to np so that the comparison is done properly.

Fixes # (issue)

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[yiyixuxu]

thanks!