Upgrade @metamask/earn-controller to version 9.0.0

A new major version of `@metamask/earn-controller`, 9.0.0, 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/earn-controller is present in this project and locate its dependency manifest and lockfile. Upgrade it to 9.0.0, then run the project's existing checks to confirm the dependency resolves and the mobile application remains healthy.

Written by the indexing model from the issue text.