front: recompute Allowance Length when position change

[achrafmohye]

Closes: #6815

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 28.46%. Comparing base (fbc0817) to head (3c76b07).

Files	Patch %	Lines
...nageTrainSchedule/Allowances/AllowancesActions.tsx	0.00%	29 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##                dev    #6882   +/-   ##
=========================================
  Coverage     28.46%   28.46%           
  Complexity     2179     2179           
=========================================
  Files          1055     1055           
  Lines        131222   131229    +7     
  Branches       2602     2602           
=========================================
+ Hits          37355    37358    +3     
- Misses        92354    92358    +4     
  Partials       1513     1513           

Flag	Coverage Δ
core	79.44% <ø> (ø)
editoast	74.92% <ø> (+0.01%)	⬆️
front	8.92% <0.00%> (-0.01%)	⬇️
gateway	2.49% <ø> (ø)
railjson_generator	87.26% <ø> (ø)
tests	83.07% <ø> (ø)

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[Math-R]

lgtm

[Akctarus]

LGTM