editoast: remove InternalError usage in Delete and Create Model API

[leovalais]

• Creates a custom error type wrapping diesel::result::Error in editoast_models
• Adapt the API of deletion and creation traits (the rest will come in another PR(s))
• Propagate the API change in views (mostly)
  • new error variants are created to accommodate some (valid) typing constraints, bringing us closer to our target error management structure
  • simplified a few map_diesel_error here and there
• The traits will be moved into editoast_models::model later

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Codecov Report

Attention: Patch coverage is 85.32110% with 16 lines in your changes missing coverage. Please review.

Project coverage is 79.91%. Comparing base (41e05a4) to head (f4c7501).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
editoast/src/models/prelude/delete.rs	0.00%	5 Missing ⚠️
editoast/editoast_models/src/model/error.rs	87.09%	4 Missing ⚠️
editoast/src/models/prelude/create.rs	0.00%	2 Missing ⚠️
editoast/src/views/temporary_speed_limits.rs	86.66%	2 Missing ⚠️
editoast/src/views/work_schedules.rs	87.50%	2 Missing ⚠️
editoast/src/views/rolling_stock.rs	95.83%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10196      +/-   ##
==========================================
- Coverage   79.94%   79.91%   -0.03%     
==========================================
  Files        1057     1058       +1     
  Lines      106302   106294       -8     
  Branches      724      724              
==========================================
- Hits        84982    84950      -32     
- Misses      21278    21302      +24     
  Partials       42       42              

Flag	Coverage Δ
editoast	73.84% <85.32%> (-0.09%)	⬇️
front	89.19% <ø> (ø)
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.00% <ø> (ø)

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