front, gateway: supporting launching front from outside the gateway reverse proxy

[ElysaSrc]

For the developers working on macOS it can be a real pain to launch the front in a local fashion. Since we require the front to be served through the gateway, we must do gymnastics to serve the dev front.

This set of changes aims to solve this by providing a way to use the front from outside the stack, making it serve locally while consuming the services on the remote service (inside the Docker VM on macOS or windows, for instance).

In order to test this, start the stack in non-host mode, shutdown the front container and on your .env.local add:

VITE_PROXY_EDITOAST="http://localhost:4000/api"
VITE_PROXY_GATEWAY="http://localhost:4000"

Start the front locally, and it should work.

[Math-R]

lgtm thanks for this one !

[emersion]

LGTM for the front (not tested)

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.83%. Comparing base (ca256f7) to head (0b3c094).
Report is 12 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9726      +/-   ##
============================================
- Coverage     42.43%   37.83%   -4.60%     
============================================
  Files          1314      990     -324     
  Lines        105823    90920   -14903     
  Branches       3305     1176    -2129     
============================================
- Hits          44902    34404   -10498     
+ Misses        58968    56062    -2906     
+ Partials       1953      454    -1499     

Flag	Coverage Δ
core	?
editoast	73.24% <ø> (-0.02%)	⬇️
front	20.11% <100.00%> (+1.32%)	⬆️
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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