Upgrade @metamask/earn-controller to version 12.0.0

A new major version of `@metamask/earn-controller`, 12.0.0, 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 the project's dependency manifest and references to @metamask/earn-controller. Check whether the package is present, update it to 12.0.0 if so, then run the affected dependency or extension test and build checks to confirm the upgrade works without regressions.

Written by the indexing model from the issue text.