front: api: adapt study_types and study_states endpoint

[younesschrifi]

Close #3729

[codecov]

Codecov Report

Merging #3960 (9d37f88) into dev (12c0b57) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                dev    #3960      +/-   ##
============================================
- Coverage     69.66%   69.65%   -0.02%     
  Complexity     2036     2036              
============================================
  Files           441      441              
  Lines         22516    22508       -8     
  Branches       1681     1681              
============================================
- Hits          15685    15677       -8     
  Misses         6026     6026              
  Partials        805      805              

Flag	Coverage Δ
front	59.35% <100.00%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
front/src/common/api/osrdMiddlewareApi.ts	91.46% <100.00%> (-0.07%)	⬇️

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[clarani]

Tested in local, everything is fine ! :) Thank u