chore: Add UX CodeOwners responsibilities (#11491)

## **Description**

Adds preliminary CODEOWNERS for Wallet UX. We'll see how accurate this
is and expand accordingly.

## **Related issues**

Fixes:

## **Manual testing steps**

1. Go to this page...
2.
3.

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

<!-- [screenshots/recordings] -->

### **After**

<!-- [screenshots/recordings] -->

## **Pre-merge author checklist**

- [ ] I’ve followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've completed the PR template to the best of my ability
- [ ] 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.

## **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.

.github/CODEOWNERS

@@ -92,3 +92,12 @@ app/components/Views/DetectedTokens @MetaMask/metamask-assets
 app/components/Views/NFTAutoDetectionModal @MetaMask/metamask-assets
 app/components/Views/NftDetails @MetaMask/metamask-assets
 app/reducers/collectibles @MetaMask/metamask-assets
+
+# UX Team
+app/components                       @MetaMask/wallet-ux
+app/reducers/experimentalSettings    @MetaMask/wallet-ux
+app/reducers/modals                  @MetaMask/wallet-ux
+app/reducers/navigation              @MetaMask/wallet-ux
+app/reducers/onboarding              @MetaMask/wallet-ux
+app/reducers/privacy                 @MetaMask/wallet-ux
+app/reducers/settings                @MetaMask/wallet-ux