[TASK] Create test user setup helpers - Prerequisites and Test Data Setup

[africanitem]

Task Details

Epic: #491 [EPIC] Prerequisites and Test Data Setup Workflow E2E Tests

Dependencies

• Depends on: [TASK] Create test environment setup helpers - Prerequisites and Test Data Setup #492

Success Criteria

• Helper functions in e2e/helpers/test-user-helpers.ts
• createTestUser() function using pattern: test-${workflow}-${Date.now()}@example.com
• loginTestUser() function using standardized login helper
• User credentials follow pattern: E2E_USERNAME env var with fallback