Upgrade @metamask/sample-controllers to version 4.0.0

A new major version of `@metamask/sample-controllers`, 4.0.0, is now available. This issue has been assigned to you and your team because you code-own this package in the `core` repo. If this package is present in this project, please prioritize upgrading it soon to unblock new features and bugfixes.

Start by checking whether @metamask/sample-controllers is present in the repository, then locate the dependency manifest and inspect the impact of upgrading it to 4.0.0. Done means the package is upgraded if present and the relevant project validation passes; the issue names no specific file or test.

Written by the indexing model from the issue text.