Upgrade @metamask/earn-controller to version 8.0.0

A new major version of `@metamask/earn-controller`, 8.0.0, 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.

Search the project’s package manifests and lockfiles for @metamask/earn-controller and confirm whether it is present. Review the dependency’s current usage before updating it to 8.0.0, then run the project’s existing checks to verify the upgrade and ensure the dependency resolves successfully.

Written by the indexing model from the issue text.