Upgrade @metamask/transaction-pay-controller to version 20.0.0

A new major version of `@metamask/transaction-pay-controller`, 20.0.0, 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 repository manifests and lockfiles for @metamask/transaction-pay-controller and inspect how the dependency is used. Update the package to 20.0.0, then run the dependency-related checks or the project's standard test suite. Done means the new version is recorded consistently and existing checks pass.

Written by the indexing model from the issue text.