Upgrade @metamask/delegation-controller to version 3.0.0

A new major version of `@metamask/delegation-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.

Check whether @metamask/delegation-controller is present in the metamask-mobile project and identify its dependency manifest and current version. Review the 3.0.0 release changes before upgrading, then run the project's existing validation checks to confirm the mobile app still builds and tests pass.

Written by the indexing model from the issue text.