Add custom account name to upgrade tests

### Describe the bug

In light of an RC issue discovered [here](https://github.com/MetaMask/metamask-mobile/issues/9988) we have the opportunity to update the upgrade tests to help ensure that a custom account name will persist through the update.

Will resolve [477](https://github.com/MetaMask/accounts-planning/issues/477)

### Expected behavior

Given the user enters a custom account name/label
When the user installs an app update
Then the custom account name/label persists

### Screenshots/Recordings

_No response_

### Steps to reproduce

1. configure wallet
2. enter custom name for an account
3. install app update
4. verify custom account name persists

### Error messages or log output

_No response_

### Detection stage

During release testing

### Version

7.24.1

### Build type

None

### Device

any

### Operating system

iOS, Android

### Additional context

_No response_

### Severity

_No response_

Start by locating the existing upgrade tests in the mobile project and review how they configure accounts and verify state after an app update. Add coverage for entering a custom account name or label before the update, then confirm the same name persists afterward on iOS and Android.

Written by the indexing model from the issue text.