Remove input field slicing in stencil tests

[edopao]

Support for array offset will soon be deprecated in DaCe, which means that DaCe backend will not accept slice of ndarrays as input fields. The filed domain should therefore start from 0.
This PR updates some test cases to pass the full filed domain to the stencil. The reference field used for validation checks that the elements outside the closure domain are not modified.

[github-actions]

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[edopao]

cscs-ci run default

[samkellerhals]

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