editoast: work-schedules: add endpoints for easier edition and viewing

[eckter]

Would fix 2/3 of https://github.com/osrd-project/osrd-confidential/issues/838, the rest is changing the etl for batched imports.

I've added a few more endpoints than just what was in the ticket, to have a complete workflow:

1. POST /work_schedules/group: create a new group (name can be empty and autofilled (the unique name thing is just painful))
2. GET /work_schedules/group: lists all the group ids
3. PUT /work_schedules/group/42: insets a work schedule into an existing group
4. GET /work_schedules/group/42: lists all the work schedules in the group
5. DELETE /workçschedules/group/42: deletes the group and its work schedules

What I have not added but could have been nice:

1. More details in GET /work_schedules/group (name, creation date, ...)
2. GET /work_schedules to list them all
3. Any kind of endpoint dealing with individual work schedules

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Codecov Report

Attention: Patch coverage is 80.83333% with 46 lines in your changes missing coverage. Please review.

Project coverage is 38.22%. Comparing base (7527a8e) to head (da16772).
Report is 10 commits behind head on dev.

Files with missing lines	Patch %	Lines
editoast/src/views/work_schedules.rs	84.10%	31 Missing ⚠️
front/src/common/api/generatedEditoastApi.ts	65.78%	13 Missing ⚠️
editoast/src/views/operational_studies.rs	66.66%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #9785      +/-   ##
==========================================
+ Coverage   38.13%   38.22%   +0.08%     
==========================================
  Files         995      995              
  Lines       91675    91891     +216     
  Branches     1193     1193              
==========================================
+ Hits        34963    35128     +165     
- Misses      56258    56309      +51     
  Partials      454      454              

Flag	Coverage Δ
editoast	73.30% <83.66%> (+0.02%)	⬆️
front	20.24% <65.78%> (+0.03%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.74% <ø> (ø)

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[woshilapin]

Nice work, just some comments about if we should do more transactional operations or not.

[leovalais]

LGTM, a few non-blocking comments :)

[Sh099078]

Great PR ! I added a few comments but mostly nitpicks

[SharglutDev]

Lgtm for front part (not tested)

[leovalais]

LGTM, thanks for the changes!

[woshilapin]

Thanks for the improvements.