refactor(qit): rename test packages folder and update naming

- Rename tests/payments-test-packages → tests/woopayments-qit
- Update package names from wcpay-* to woopayments-*
- Update qit-test.json manifests to use woopayments naming
- Update README to reflect new folder structure

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: mgascam

tests/payments-test-packages/.gitignore renamed to tests/woopayments-qit/.gitignore

@@ -1,11 +1,11 @@
-# WooCommerce Payments QIT E2E Test Packages
+# WooPayments QIT E2E Test Packages
 
-This directory contains end-to-end tests for WooCommerce Payments, organized as QIT test subpackages.
+This directory contains end-to-end tests for WooPayments, organized as QIT test subpackages.
 
 ## Package Structure
 
 ```
-payments-test-packages/
+woopayments-qit/
 ├── shared/          # Utility package: bootstrap, config, utilities
 │   ├── bootstrap/   # Environment setup scripts
 │   ├── config/      # Test configuration