editoast: doc, scripts: improve openfga management for devs

[bougue-pe]

fix tests doc on the way

supersedes #11100

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.84%. Comparing base (54a1e53) to head (2909623).
Report is 7 commits behind head on dev.

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Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #11167   +/-   ##
=======================================
  Coverage   80.83%   80.84%           
=======================================
  Files        1115     1115           
  Lines      112507   112520   +13     
  Branches      759      759           
=======================================
+ Hits        90945    90964   +19     
+ Misses      21507    21501    -6     
  Partials       55       55           

Flag	Coverage Δ
editoast	72.49% <ø> (+0.02%)	⬆️
front	89.89% <ø> (+<0.01%)	⬆️
gateway	2.49% <ø> (ø)
osrdyne	2.53% <ø> (ø)
railjson_generator	87.58% <ø> (ø)
tests	88.82% <ø> (+0.01%)	⬆️

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[leovalais]

Thanks!

[hamz2a]

Thank you!

[woshilapin]

Might need some synchronization with #11115

[woshilapin]

Thank you for filling up the holes.