feat(edge_services): add GetPipelineStages endpoint

[scaleway-bot]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.31%. Comparing base (c80a70f) to head (57b8a02).
Report is 277 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1449      +/-   ##
==========================================
+ Coverage   94.01%   95.31%   +1.30%     
==========================================
  Files          53       89      +36     
  Lines        3427     4892    +1465     
  Branches      476      941     +465     
==========================================
+ Hits         3222     4663    +1441     
- Misses        205      229      +24     

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