Remove host polar grid in tests

[AbdelhadiKara]

Remove PolarGrid< Kokkos::HostSpace > from tests

Modify some functions in the tests to make it able to use PolarGrid< DefaultMemorySpace >.
When possible, the computations are directly done in gpu kernels.

This PR focuses on /tests/Interpolation/ folder.
remove two occurences of host allocated solution_grid in tests/GMGPolar

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.73%. Comparing base (efd9941) to head (386a9e4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #290      +/-   ##
==========================================
- Coverage   95.73%   95.73%   -0.01%     
==========================================
  Files          79       79              
  Lines        8622     8620       -2     
==========================================
- Hits         8254     8252       -2     
  Misses        368      368              

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[AbdelhadiKara]

on v100 at 386a9e4
100% tests passed, without MUMPS.

[EmilyBourne]

on v100 at 386a9e4
100% tests passed, with MUMPS.

[AbdelhadiKara]

on v100 at 386a9e4 100% tests passed, with MUMPS.

Thank you for the test