Upgrade @metamask/account-tree-controller to version 3.0.0

A new major version of `@metamask/account-tree-controller`, 3.0.0, 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 metamask-mobile repository for references to @metamask/account-tree-controller and identify the dependency manifest and lockfile that need updating. Check the package's 3.0.0 release requirements before changing the version, then verify that the dependency is upgraded successfully and the existing project checks still pass.

Written by the indexing model from the issue text.