Upgrade @metamask/account-tree-controller to version 4.0.0

A new major version of `@metamask/account-tree-controller`, 4.0.0, 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/account-tree-controller is present in the metamask-extension project, then inspect its dependency entry and the core package context. Done means the project uses version 4.0.0 and its relevant existing checks pass without regressions.

Written by the indexing model from the issue text.