feat: Add UCS testing integration with environment flag
- Add UCS_ENABLED environment variable support in cypress.config.js
- Implement setupUCSConfigs command in commands.js with helper functions
- Add automatic UCS config setup test (00003a-UCSSetup.cy.js) after connector creation
- Support for all flows: Authorize, Capture, PSync, Execute, RSync, Void
- Graceful skip when UCS_ENABLED=false or not set
- No cleanup needed - merchant ID isolation ensures test independence
- Usage: UCS_ENABLED=true CYPRESS_CONNECTOR=connector_name npm run cypress:payments
