Upgrade @metamask/money-account-balance-service to version 2.0.0

A new major version of `@metamask/money-account-balance-service`, 2.0.0, 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 lockfile entries for @metamask/money-account-balance-service, then review the package's 2.0.0 release changes for breaking updates. Upgrade the dependency to 2.0.0, run the existing project checks, and confirm the mobile app still builds and tests pass.

Written by the indexing model from the issue text.