Add missing unit test markers

[dpanici]

• Adds missing unit test labels for some tests.
• Adds a precommit hook that checks tests folder and warns the user if a test without mark is added

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.51%. Comparing base (ebb3a69) to head (cd90a6a).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1305      +/-   ##
==========================================
+ Coverage   94.48%   95.51%   +1.03%     
==========================================
  Files          96       96              
  Lines       23975    23975              
==========================================
+ Hits        22652    22900     +248     
+ Misses       1323     1075     -248     

Files with missing lines	Coverage Δ
desc/objectives/objective_funs.py	94.75% <ø> (+0.13%)	⬆️

... and 21 files with indirect coverage changes

[f0uriest]

We should add a pre commit check to make sure this doesn't keep happening

[YigitElma]

We should add a pre commit check to make sure this doesn't keep happening

I can try to add this in this PR or some other one

[github-actions]

|             benchmark_name             |         dt(%)          |         dt(s)          |        t_new(s)        |        t_old(s)        | 
| -------------------------------------- | ---------------------- | ---------------------- | ---------------------- | ---------------------- |
 test_build_transform_fft_midres         |     -1.13 +/- 4.99     | -6.90e-03 +/- 3.05e-02 |  6.04e-01 +/- 2.1e-02  |  6.11e-01 +/- 2.2e-02  |
 test_build_transform_fft_highres        |     +1.73 +/- 5.32     | +1.71e-02 +/- 5.26e-02 |  1.01e+00 +/- 3.4e-02  |  9.89e-01 +/- 4.0e-02  |
 test_equilibrium_init_lowres            |    +13.04 +/- 12.25    | +4.85e-01 +/- 4.56e-01 |  4.21e+00 +/- 4.5e-01  |  3.72e+00 +/- 2.7e-02  |
 test_objective_compile_atf              |     +4.54 +/- 4.77     | +3.57e-01 +/- 3.75e-01 |  8.22e+00 +/- 3.1e-01  |  7.86e+00 +/- 2.2e-01  |
 test_objective_compute_atf              |     +2.62 +/- 3.27     | +2.72e-04 +/- 3.40e-04 |  1.07e-02 +/- 3.1e-04  |  1.04e-02 +/- 1.4e-04  |
 test_objective_jac_atf                  |     +1.10 +/- 3.31     | +2.13e-02 +/- 6.39e-02 |  1.95e+00 +/- 2.8e-02  |  1.93e+00 +/- 5.7e-02  |
 test_perturb_1                          |     +5.55 +/- 2.41     | +6.90e-01 +/- 3.00e-01 |  1.31e+01 +/- 1.8e-01  |  1.24e+01 +/- 2.4e-01  |
 test_proximal_jac_atf                   |     +1.35 +/- 0.83     | +1.09e-01 +/- 6.70e-02 |  8.19e+00 +/- 4.4e-02  |  8.08e+00 +/- 5.0e-02  |
 test_proximal_freeb_compute             |     -0.69 +/- 0.78     | -1.27e-03 +/- 1.44e-03 |  1.83e-01 +/- 1.3e-03  |  1.85e-01 +/- 5.3e-04  |
 test_build_transform_fft_lowres         |     +1.72 +/- 4.96     | +8.90e-03 +/- 2.56e-02 |  5.25e-01 +/- 2.5e-02  |  5.16e-01 +/- 7.4e-03  |
 test_equilibrium_init_medres            |     +0.68 +/- 1.33     | +2.78e-02 +/- 5.42e-02 |  4.12e+00 +/- 4.5e-02  |  4.09e+00 +/- 3.1e-02  |
 test_equilibrium_init_highres           |     +0.32 +/- 0.87     | +1.73e-02 +/- 4.72e-02 |  5.48e+00 +/- 3.9e-02  |  5.46e+00 +/- 2.6e-02  |
 test_objective_compile_dshape_current   |     -0.19 +/- 0.85     | -7.29e-03 +/- 3.29e-02 |  3.85e+00 +/- 3.0e-02  |  3.86e+00 +/- 1.3e-02  |
 test_objective_compute_dshape_current   |     +0.96 +/- 1.61     | +3.41e-05 +/- 5.72e-05 |  3.59e-03 +/- 3.1e-05  |  3.56e-03 +/- 4.8e-05  |
 test_objective_jac_dshape_current       |     -2.66 +/- 7.32     | -1.09e-03 +/- 3.01e-03 |  4.00e-02 +/- 2.5e-03  |  4.11e-02 +/- 1.6e-03  |
 test_perturb_2                          |     -0.02 +/- 1.03     | -4.09e-03 +/- 1.81e-01 |  1.76e+01 +/- 8.1e-02  |  1.76e+01 +/- 1.6e-01  |
 test_proximal_freeb_jac                 |     -1.51 +/- 1.45     | -1.14e-01 +/- 1.09e-01 |  7.42e+00 +/- 7.2e-02  |  7.53e+00 +/- 8.2e-02  |
 test_solve_fixed_iter                   |     -0.12 +/- 59.28    | -6.15e-03 +/- 2.96e+00 |  4.99e+00 +/- 2.1e+00  |  4.99e+00 +/- 2.1e+00  |