Refactor inventory check to identify first out-of-stock product

[seer-by-sentry]

Fixes REACT-5XC. The issue was that: The enough_inventory? method in the backend checkout controller is hardcoded to return false, causing the "Not enough inventory" exception on every checkout attempt.

• Changes the inventory check logic to identify and return the first product that is out of stock, rather than iterating through all products and potentially breaking on the first error.
• Introduces get_first_out_of_stock_product method to determine the first product with insufficient inventory.
• Modifies the error handling to return immediately upon finding an out-of-stock product, preventing further checks.

This fix was generated by Seer in Sentry, triggered by Danny Abou-Chakra. 👁️ Run ID: 76894

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
empower	⬜️ Ignored (Inspect)	Visit Preview		Jun 12, 2025 0:48am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.76%. Comparing base (8573fd1) to head (89b2b76).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

❌ Your project check has failed because the head coverage (27.76%) is below the target coverage (35.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #854      +/-   ##
==========================================
- Coverage   27.86%   27.76%   -0.11%     
==========================================
  Files          41       41              
  Lines        1055     1059       +4     
  Branches      115      115              
==========================================
  Hits          294      294              
- Misses        742      746       +4     
  Partials       19       19              

Flag	Coverage Δ
api	6.58% <ø> (-0.06%)	⬇️
frontend	44.72% <ø> (ø)

Components	Coverage Δ
checkout_module	6.58% <ø> (-0.06%)	⬇️
product_component	41.47% <ø> (ø)

see 3 files with indirect coverage changes