Rename discounts.json to openapi.json

[TharmiganK]

Purpose

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.31%. Comparing base (684d483) to head (74cec2b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #14   +/-   ##
=======================================
  Coverage   26.31%   26.31%           
=======================================
  Files           2        2           
  Lines         266      266           
  Branches      190      190           
=======================================
  Hits           70       70           
  Misses        196      196           

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