Use Default memspace in test polargrid

[AbdelhadiKara]

Use only DefaultMemorySpace allocated PolarGrid class in its own tests.
Create device kernels to compute errors.

[AbdelhadiKara]

It seems the is some duplication in this test file , GridJumpTest, AccessorsTest, CoordinatesTest, what do you think @EmilyBourne @julianlitz ?

[EmilyBourne]

It seems the is some duplication in this test file , GridJumpTest, AccessorsTest, CoordinatesTest, what do you think @EmilyBourne @julianlitz ?

The splitting_radius seems to be different between the 3

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.72%. Comparing base (2d7b293) to head (903ed89).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #292      +/-   ##
==========================================
- Coverage   95.73%   95.72%   -0.01%     
==========================================
  Files          79       79              
  Lines        8620     8618       -2     
==========================================
- Hits         8252     8250       -2     
  Misses        368      368              

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[EmilyBourne]

On v100 at 903ed89:
Without MUMPS:

100% tests passed, 0 tests failed out of 496

With MUMPS:

100% tests passed, 0 tests failed out of 500