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Fix uvw_to_xyz kernel

Nicolas Tancogne-Dejean requested to merge fix_kernel_gradient into release-12.0

Description

The metric was transposed in the kernel for converting the gradient to the Cartesian coordinates, leading to the wrong current on GPUs for non-orthogonal cells. This also fixes the calculation of the divergence in non-orthogonal cells.

News snippet

Fix a bug in the GPU calculation of the gradient and divergences in non-orthogonal cells.

Checklist

  • I have checked that my code follows the Octopus coding standards
  • I have added tests for all the new features added in this request.

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