Do not ensure nestedness before fitting geometry of VMEC fit

[dpanici]

When loading a VMEC equilibrium, changes VMECIO.load to not try to ensure nestedness before fitting the geometry of the .nc file with the Fourier-Zernike basis. This can avoid situations where the guess based off the axis and surface is unnested when the fit of the geometry is actually fine and nested.

Resolves #1497

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.63%. Comparing base (820f94c) to head (d0e1b31).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1500   +/-   ##
=======================================
  Coverage   95.63%   95.63%           
=======================================
  Files         101      101           
  Lines       25542    25542           
=======================================
  Hits        24428    24428           
  Misses       1114     1114           

Files with missing lines	Coverage Δ
desc/vmec.py	91.88% <100.00%> (ø)

... and 2 files with indirect coverage changes

[github-actions]

|             benchmark_name             |         dt(%)          |         dt(s)          |        t_new(s)        |        t_old(s)        | 
| -------------------------------------- | ---------------------- | ---------------------- | ---------------------- | ---------------------- |
 test_build_transform_fft_lowres         |     +2.51 +/- 4.80     | +1.46e-02 +/- 2.78e-02 |  5.94e-01 +/- 1.5e-02  |  5.79e-01 +/- 2.4e-02  |
 test_equilibrium_init_medres            |     -2.21 +/- 5.46     | -1.03e-01 +/- 2.56e-01 |  4.57e+00 +/- 1.5e-01  |  4.68e+00 +/- 2.1e-01  |
 test_equilibrium_init_highres           |     -0.54 +/- 2.96     | -3.20e-02 +/- 1.77e-01 |  5.93e+00 +/- 1.3e-01  |  5.97e+00 +/- 1.2e-01  |
 test_objective_compile_dshape_current   |     -0.48 +/- 5.05     | -2.00e-02 +/- 2.09e-01 |  4.13e+00 +/- 1.6e-01  |  4.15e+00 +/- 1.4e-01  |
 test_objective_compute_dshape_current   |     -3.79 +/- 5.72     | -2.05e-04 +/- 3.09e-04 |  5.19e-03 +/- 1.8e-04  |  5.40e-03 +/- 2.5e-04  |
 test_objective_jac_dshape_current       |     -6.03 +/- 8.73     | -2.81e-03 +/- 4.06e-03 |  4.38e-02 +/- 6.5e-04  |  4.66e-02 +/- 4.0e-03  |
 test_perturb_2                          |     +0.17 +/- 7.73     | +3.77e-02 +/- 1.68e+00 |  2.17e+01 +/- 1.6e+00  |  2.17e+01 +/- 4.0e-01  |
 test_proximal_freeb_jac                 |     +0.56 +/- 7.14     | +4.61e-02 +/- 5.91e-01 |  8.32e+00 +/- 2.9e-01  |  8.27e+00 +/- 5.1e-01  |
 test_solve_fixed_iter                   |     -2.38 +/- 2.80     | -8.31e-01 +/- 9.76e-01 |  3.40e+01 +/- 6.3e-01  |  3.49e+01 +/- 7.4e-01  |
 test_LinearConstraintProjection_build   |     -3.39 +/- 3.33     | -3.82e-01 +/- 3.76e-01 |  1.09e+01 +/- 3.1e-01  |  1.13e+01 +/- 2.2e-01  |
 test_build_transform_fft_midres         |     -2.12 +/- 3.01     | -1.38e-02 +/- 1.96e-02 |  6.38e-01 +/- 1.7e-02  |  6.52e-01 +/- 9.9e-03  |
 test_build_transform_fft_highres        |     -1.71 +/- 1.81     | -1.75e-02 +/- 1.85e-02 |  1.00e+00 +/- 1.2e-02  |  1.02e+00 +/- 1.4e-02  |
 test_equilibrium_init_lowres            |     -0.21 +/- 6.78     | -8.59e-03 +/- 2.78e-01 |  4.09e+00 +/- 9.9e-02  |  4.10e+00 +/- 2.6e-01  |
 test_objective_compile_atf              |     +1.99 +/- 1.19     | +1.62e-01 +/- 9.66e-02 |  8.29e+00 +/- 8.2e-02  |  8.12e+00 +/- 5.1e-02  |
 test_objective_compute_atf              |     +3.36 +/- 7.12     | +5.42e-04 +/- 1.15e-03 |  1.67e-02 +/- 9.0e-04  |  1.61e-02 +/- 7.1e-04  |
 test_objective_jac_atf                  |     +0.40 +/- 2.36     | +7.67e-03 +/- 4.57e-02 |  1.94e+00 +/- 1.9e-02  |  1.93e+00 +/- 4.2e-02  |
 test_perturb_1                          |     -0.21 +/- 3.17     | -3.26e-02 +/- 4.85e-01 |  1.53e+01 +/- 1.7e-01  |  1.53e+01 +/- 4.6e-01  |
 test_proximal_jac_atf                   |     +0.53 +/- 1.17     | +4.37e-02 +/- 9.66e-02 |  8.30e+00 +/- 6.3e-02  |  8.26e+00 +/- 7.3e-02  |
 test_proximal_freeb_compute             |     +0.66 +/- 1.02     | +1.31e-03 +/- 2.03e-03 |  2.01e-01 +/- 1.6e-03  |  1.99e-01 +/- 1.3e-03  |
 test_solve_fixed_iter_compiled          |     +2.26 +/- 1.23     | +4.59e-01 +/- 2.49e-01 |  2.08e+01 +/- 2.1e-01  |  2.03e+01 +/- 1.3e-01  |