Upgrade @metamask/earn-controller to version 7.0.0

A new major version of `@metamask/earn-controller`, 7.0.0, 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 locating @metamask/earn-controller in the project's dependency manifests and checking whether it is present. Review the package's upgrade requirements and existing validation commands; done means the project uses version 7.0.0 successfully without regressions.

Written by the indexing model from the issue text.