## **Description**

Convert the list of unit tests to use react-testing-library instead of
enzyme for the following files:
```
'app/components/Views/Root/index.test.tsx',
'app/components/Views/NavigationUnitTest/TestScreen3.test.js',
'app/components/Views/NavigationUnitTest/TestScreen2.test.js',
'app/components/Views/NavigationUnitTest/TestScreen1.test.js',
'app/components/Views/ImportPrivateKeySuccess/index.test.tsx',
'app/components/Views/AccountBackupStep1B/index.test.tsx',
'app/components/UI/WebviewProgressBar/index.test.tsx',
'app/components/UI/SeedphraseModal/index.test.tsx',
'app/components/UI/PhishingModal/index.test.tsx',
'app/components/UI/FoxScreen/index.test.tsx',
'app/components/UI/FadeView/index.test.tsx',
'app/components/UI/CustomAlert/index.test.tsx',
'app/components/UI/Confetti/index.test.tsx',
'app/components/UI/Collectibles/index.test.tsx',
'app/components/UI/Button/index.test.tsx',
'app/components/UI/AnimatedSpinner/index.test.tsx',
'app/components/UI/AddCustomToken/index.test.tsx',
```

## **Related issues**

Fixes: #8616 

## **Manual testing steps**

Not Applicable

## **Screenshots/Recordings**

Not Applicable

## **Pre-merge author checklist**

- [x] I’ve followed [MetaMask Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've clearly explained what problem this PR is solving and how it
is solved.
- [x] I've linked related issues
- [ ] I've included manual testing steps
- [ ] I've included screenshots/recordings if applicable
- [ ] I’ve included tests if applicable
- [ ] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [ ] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.
- [x] I’ve properly set the pull request status:
  - [ ] In case it's not yet "ready for review", I've set it to "draft".
- [x] In case it's "ready for review", I've changed it from "draft" to
"non-draft".

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

---------

Co-authored-by: Cal Leung <cleun007@gmail.com>