Remove static_attrs variables from constants dicts in _omnigenity objectives

[dpanici]

Resolves #2295

[github-actions]

Memory benchmark result

|               Test Name                |      %Δ      |    Master (MB)     |      PR (MB)       |    Δ (MB)    |    Time PR (s)     |  Time Master (s)   |
| -------------------------------------- | ------------ | ------------------ | ------------------ | ------------ | ------------------ | ------------------ |
  test_objective_jac_w7x                 |    0.10 %    |     4.247e+03      |     4.251e+03      |     4.45     |       32.04        |       28.79        |
  test_proximal_jac_w7x_with_eq_update   |   -0.79 %    |     6.873e+03      |     6.819e+03      |    -54.20    |       154.35       |       153.62       |
  test_proximal_freeb_jac                |    0.06 %    |     1.353e+04      |     1.353e+04      |     8.50     |       80.22        |       81.37        |
  test_proximal_freeb_jac_blocked        |    0.30 %    |     7.858e+03      |     7.881e+03      |    23.28     |       68.92        |       69.44        |
  test_proximal_freeb_jac_batched        |   -0.03 %    |     7.881e+03      |     7.879e+03      |    -2.35     |       68.64        |       69.57        |
  test_proximal_jac_ripple               |   -0.52 %    |     3.792e+03      |     3.772e+03      |    -19.75    |       53.46        |       52.88        |
  test_proximal_jac_ripple_bounce1d      |   -1.05 %    |     4.022e+03      |     3.980e+03      |    -42.40    |       69.23        |       66.65        |
  test_eq_solve                          |   -0.58 %    |     1.823e+03      |     1.812e+03      |    -10.55    |       53.85        |       52.62        |
  test_objective_quadratic_flux_jac      |    0.35 %    |     1.885e+03      |     1.892e+03      |     6.67     |       36.42        |       34.89        |

For the memory plots, go to the summary of Memory Benchmarks workflow and download the artifact.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.35%. Comparing base (7168ac7) to head (b548583).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2297      +/-   ##
==========================================
- Coverage   94.35%   94.35%   -0.01%     
==========================================
  Files         101      101              
  Lines       29053    29053              
==========================================
- Hits        27414    27413       -1     
- Misses       1639     1640       +1     

Files with missing lines	Coverage Δ
desc/objectives/_omnigenity.py	97.04% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[YigitElma]

Minor comment, otherwise looks good.

[YigitElma]

If the intent is to test if the static attribute error is fixed here, then I would suggest calling obj.compute_unscaled since plain compute is not jitted and wouldn't recreate the issue.