Fix retro-compatibility with 222 and 221

[PProfizi]

The ANSYS_VERSION input in retro tests in ci.yml and ci_release.yml was set to env.ANSYS_VERSION instead of matrix.ANSYS_VERSION, meaning retro tests actually ran on the latest server.

Once this is rectified, it appears that operator extract_scoping is too recent to be used.
It is in the code at:

• scoping workflow associated to a DataFrame, instantiated in _get_result for each Simulation variant -> Actually unused, remove useless code in HarmonicMechanicalSimulation, ModalMechanicalSimulation and TransientMechanicalSimulation
• in MeshIndex._evaluate_values in case self._scoping_ref is None -> implement a retro-compatible (slower) version when DPF<5.0

[codecov]

Codecov Report

Merging #339 (9e1ca0d) into master (5c5d79a) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

❗ Current head 9e1ca0d differs from pull request most recent head c1d2104. Consider uploading reports for the commit c1d2104 to get more accurate results

@@            Coverage Diff             @@
##           master     #339      +/-   ##
==========================================
- Coverage   82.72%   82.66%   -0.06%     
==========================================
  Files          35       35              
  Lines        3184     3173      -11     
==========================================
- Hits         2634     2623      -11     
  Misses        550      550