editoast: add comment explaining #[allow(dead_code)] usage

[hamz2a]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.62%. Comparing base (007883a) to head (d51b561).
Report is 5 commits behind head on dev.

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Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #11066   +/-   ##
=======================================
  Coverage   80.62%   80.62%           
=======================================
  Files        1101     1101           
  Lines      112366   112372    +6     
  Branches      747      747           
=======================================
+ Hits        90590    90595    +5     
- Misses      21733    21734    +1     
  Partials       43       43           

Flag	Coverage Δ
editoast	72.18% <ø> (+<0.01%)	⬆️
front	89.92% <ø> (ø)
gateway	2.18% <ø> (ø)
osrdyne	2.53% <ø> (ø)
railjson_generator	87.58% <ø> (ø)
tests	87.90% <ø> (ø)

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