React Native UI: Add Unit Testing to Component Template Using Testing Library in MetaMask Design System Monorepo

### **Description**

Add unit testing functionality to the component template in the MetaMask design system monorepo. This will involve setting up tests using the [React Testing Library](https://testing-library.com/docs/react-testing-library/intro) to ensure that all UI components are covered by unit tests during development.

### **Technical Details**

- Integrate [React Testing Library](https://testing-library.com/docs/react-testing-library/intro) into the component template within the MetaMask design system monorepo.
- Create example unit tests for the existing component template as a reference for future component development.
- Update the component template to automatically include unit tests for new components.
- Ensure that unit tests are included in the CI pipeline for continuous testing and coverage.
- Provide documentation or examples on writing unit tests for components in the design system.

### **Acceptance Criteria**

- React Testing Library is successfully integrated into the component template.
- New components created using the template automatically include a basic unit test.
- Unit tests should run automatically as part of the CI process, blocking code with failing tests from being merged. - Already does goo to check
### **References**

- [React Testing Library](https://testing-library.com/docs/react-testing-library/intro)

Locate the component template and the existing CI configuration, then review how components and tests are currently generated and run. Add the requested React Testing Library examples and template coverage, ensure new components include a basic test, and verify that CI runs the tests and blocks failures; the issue notes that CI may already support this, so confirm that first.

Written by the indexing model from the issue text.