chore(profile-sync-controller): bring test grouping in line with other controllers (#6530)

## Explanation

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This PR updates the `AuthenticationController` and
`UserStorageController` test suites to follow the same grouping and
structure used in other controller tests.

## References

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## Checklist

- [ ] I've updated the test suite for new or updated code as appropriate
- [ ] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [ ] I've communicated my changes to consumers by [updating changelogs
for packages I've
changed](https://github.com/MetaMask/core/tree/main/docs/contributing.md#updating-changelogs),
highlighting breaking changes as necessary
- [ ] I've prepared draft pull requests for clients and consumer
packages to resolve any breaking changes

Author: cryptodev-2s