Fix broken pagination in response for simple product creation

[mirekm]

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Latest commit: af9d35c

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[Copilot]

Pull request overview

This PR fixes a bug where pagination parameters were missing when creating simple product variants, which would cause incomplete data to be returned for attribute choices.

Changes:

• Added firstValues: VALUES_PAGINATE_BY parameter to the variant creation mutation variables for simple products
• Imported VALUES_PAGINATE_BY constant from config

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.58%. Comparing base (5b88aac) to head (af9d35c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##             main    #6305     +/-   ##
=========================================
  Coverage   42.58%   42.58%             
=========================================
  Files        2497     2497             
  Lines       43376    43376             
  Branches    10250    10233     -17     
=========================================
  Hits        18470    18470             
- Misses      23581    24869   +1288     
+ Partials     1325       37   -1288     

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