Adapt Infra to ModelV2

[leovalais]

closes #6033

Tip

Review each commit individually.

Infra-related changes

• Adapt Infra to ModelV2
• Migration to add the expected default values to the infra table
• Use Changeset<Infra> instead of InfraForm where it makes sense
• Better mutability tracking

Test changes

• Replace test_infra_and_delete by test_infra_transaction
• Some light TestFixture<T: Model> enhancements

ModelV2 changes

• Make Patch<M>.changeset field public

[codecov]

Codecov Report

Attention: Patch coverage is 82.88889% with 77 lines in your changes are missing coverage. Please review.

Project coverage is 28.99%. Comparing base (ce98262) to head (8d4fdbe).
Report is 1 commits behind head on dev.

Files	Patch %	Lines
editoast/src/modelsv2/infra.rs	76.84%	44 Missing ⚠️
editoast/src/views/timetable/import.rs	0.00%	8 Missing ⚠️
editoast/src/views/infra/mod.rs	91.54%	6 Missing ⚠️
editoast/src/views/infra/routes.rs	50.00%	5 Missing ⚠️
editoast/src/views/train_schedule/mod.rs	0.00%	5 Missing ⚠️
editoast/src/views/infra/pathfinding.rs	0.00%	3 Missing ⚠️
editoast/src/views/infra/lines.rs	0.00%	2 Missing ⚠️
editoast/src/views/infra/edition.rs	91.66%	1 Missing ⚠️
editoast/src/views/pathfinding/mod.rs	85.71%	1 Missing ⚠️
editoast/src/views/v2/path.rs	80.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #6975      +/-   ##
============================================
- Coverage     29.04%   28.99%   -0.06%     
  Complexity     2244     2244              
============================================
  Files          1070     1070              
  Lines        132780   132723      -57     
  Branches       2708     2713       +5     
============================================
- Hits          38570    38477      -93     
- Misses        92634    92669      +35     
- Partials       1576     1577       +1     

Flag	Coverage Δ
core	79.81% <ø> (+<0.01%)	⬆️
editoast	74.66% <82.88%> (-0.21%)	⬇️
front	9.29% <ø> (ø)
gateway	2.45% <ø> (ø)
railjson_generator	87.15% <ø> (ø)
tests	83.07% <ø> (ø)

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[flomonster]

Great PR. Thanks 👏 (review + tested)