chore: Strip more custom tags in api-gen

[pan-kot]

Cloudscape uses custom tags to trigger automatic transformations on types or alter docs presentation in the website. These tags should be removed from the generated proxy interfaces.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.39%. Comparing base (db5d24f) to head (0842c97).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #128   +/-   ##
=======================================
  Coverage   94.38%   94.39%           
=======================================
  Files          14       14           
  Lines         677      678    +1     
  Branches      175      175           
=======================================
+ Hits          639      640    +1     
  Misses         38       38           

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