feat(edge_services): add plan backend limit

[scaleway-bot]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.85%. Comparing base (69e094c) to head (67f49c7).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5312      +/-   ##
==========================================
+ Coverage   55.82%   55.85%   +0.03%     
==========================================
  Files         317      317              
  Lines       71704    71664      -40     
==========================================
  Hits        40028    40028              
+ Misses      30182    30142      -40     
  Partials     1494     1494              

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