Fix casing issue with promo tests

[sol-loup]

Based on the test fixes I made, here's a PR description using the template:

Description

This PR fixes failing unit tests in FeedUploadUtilsTest that were expecting lowercase coupon codes but receiving uppercase values. The tests were creating coupons with uppercase titles (e.g., 'COUPON-CODE-1') but asserting against lowercase values in the expected results.

Type of change

• Fix (non-breaking change which fixes an issue)

Checklist

• I have commented my code, particularly in hard-to-understand areas, if any.
• I have confirmed that my changes do not introduce any new PHPCS warnings or errors.
• I have checked plugin debug logs that my changes do not introduce any new PHP warnings or FATAL errors.
• I followed general Pull Request best practices. Meta employees to follow this wiki.
• I have added tests (if necessary) and all the new and existing unit tests pass locally with my changes.
• I have completed dogfooding and QA testing, or I have conducted thorough due diligence to ensure that it does not break existing functionality.
• I have updated or requested update to plugin documentations (if necessary). Meta employees to follow this wiki.

Changelog entry

Fixed unit tests expecting lowercase coupon codes to match uppercase coupon titles

Test Plan

1. Run the unit tests with: vendor/bin/phpunit tests/Unit/Feed/FeedUploadUtilsTest.php
2. Verify that all tests pass, specifically:
   • test_get_coupons_data_valid_coupon_with_target_product
   • test_get_coupons_data_valid_shipping_coupon
   • test_get_coupons_data_coupon_with_included_excluded_products
   • test_get_coupons_data_coupon_with_included_excluded_categories

Screenshots

Before

Tests were failing with assertion errors showing mismatched coupon codes:

--- Expected
+++ Actual
@@ @@
-    'title' => 'coupon-code-1'
+    'title' => 'COUPON-CODE-1'

After

All tests pass successfully with the corrected uppercase expectations matching the actual coupon titles created in the tests.

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