More OpenApi annotations for /infra endpoints

[leovalais]

Important

Deletes the GET /infra/cache_status endpoint since the front-end doesn't use it (it wasn't even included in the openapi_legacy).
I hardly imagine that other editoast consumers use it, especially since it's not documented.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.22222% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 29.36%. Comparing base (3906d4d) to head (eb2d663).
Report is 9 commits behind head on dev.

Files	Patch %	Lines
front/src/common/api/osrdEditoastApi.ts	90.90%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #7551      +/-   ##
============================================
- Coverage     29.38%   29.36%   -0.02%     
  Complexity     2014     2014              
============================================
  Files          1200     1200              
  Lines        147465   147418      -47     
  Branches       2894     2894              
============================================
- Hits          43328    43294      -34     
+ Misses       102433   102420      -13     
  Partials       1704     1704              

Flag	Coverage Δ
core	75.05% <ø> (-0.01%)	⬇️
editoast	72.49% <100.00%> (+<0.01%)	⬆️
front	9.75% <90.90%> (-0.01%)	⬇️
gateway	2.41% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	71.85% <ø> (ø)

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