Set displayName for Fantom configuration (#52778)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52778

Changelog: [internal]

Jest has an option to select a specific project when running tests:

```
jest --selectProjects fantom
```

But for this to work, a `displayName` option needs to be set in the project configuration. This adds that for Fantom tests (using `fantom`).

Reviewed By: rshest

Differential Revision: D78802516

fbshipit-source-id: 483e7c1450b1f97961e4e43c963fac3ce82cee58