feat(utils-ean-validation, remission-list): add EAN validation library and implement exact search
Create new EAN validation utility library with validator function and isEan helper.
Implement exact search functionality for remission lists that bypasses filters
when scanning EAN codes or performing exact searches.
Changes:
- Add new utils/ean-validation library with EAN regex validation
- Export eanValidator for Angular reactive forms integration
- Export isEan utility function for EAN validation checks
- Configure library with Vitest for testing
- Update remission list resource to support exact search mode
- Clear filters and orderBy when performing EAN-based searches
- Add data attributes to product info component for E2E testing
Ref: #5128
