Move EnvelopeSimContext out of Allowances initialization

[Castavo]

Doing this refactor has several advantages:

• We avoid duplication of the context (namely in RJSStandaloneTrainScheduleParser), since we always build a EnvelopeSimContext in StandaloneSim.run .
• With power restrictions, EnvelopeSimContext init is also going to get slower, so avoid duplication has twice the benefits.
• The context isn't semantically linked to the Allowance classes.
• EnvelopeSimContext initialisation is going to get a bit more complex, so avoiding to maintain a custom building method is preferable

[codecov]

Codecov Report

Merging #3529 (39582cf) into dev (8705e14) will decrease coverage by 0.01%.
The diff coverage is 96.15%.

@@             Coverage Diff              @@
##                dev    #3529      +/-   ##
============================================
- Coverage     68.20%   68.20%   -0.01%     
+ Complexity     1897     1896       -1     
============================================
  Files           411      411              
  Lines         20443    20438       -5     
  Branches       1519     1519              
============================================
- Hits          13943    13939       -4     
  Misses         5798     5798              
+ Partials        702      701       -1     

Flag	Coverage Δ
core	79.17% <96.15%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../fr/sncf/osrd/cli/StandaloneSimulationCommand.java	0.00% <0.00%> (ø)
...pe_sim/allowances/AbstractAllowanceWithRanges.java	89.82% <100.00%> (-0.05%)	⬇️
.../osrd/envelope_sim/allowances/LinearAllowance.java	100.00% <100.00%> (ø)
.../osrd/envelope_sim/allowances/MarecoAllowance.java	97.14% <100.00%> (ø)
...fr/sncf/osrd/api/StandaloneSimulationEndpoint.java	93.93% <100.00%> (ø)
.../envelope_sim_infra/EnvelopeSimContextBuilder.java	75.00% <100.00%> (+8.33%)	⬆️
...ljson/parser/RJSStandaloneTrainScheduleParser.java	68.05% <100.00%> (-0.87%)	⬇️
...ava/fr/sncf/osrd/standalone_sim/StandaloneSim.java	90.90% <100.00%> (ø)
...ava/fr/sncf/osrd/stdcm/graph/STDCMSimulations.java	97.50% <100.00%> (ø)
.../sncf/osrd/stdcm/graph/STDCMStandardAllowance.java	76.31% <100.00%> (ø)

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[Castavo]

The coverage goes down only because I removed lines that were tested, I did not add untested lines