refactor: migrate assets controllers messenger

[mikesposito]

Explanation

This PR migrates all remaining assets controllers to @metamask/messenger instead of @metamask/base-controller. This is part of a larger effort to migrate all controllers to use @metamask/messenger.

References

• Related to Implement messenger delegation #5626

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

---

Note

Replaces RestrictedMessenger with @metamask/messenger and adopts @metamask/base-controller/next across assets controllers and tests, updating metadata and event wiring accordingly.

• Controllers:
  • Migrate MultichainAssetsController, MultichainBalancesController, NftDetectionController, RatesController, and TokenSearchDiscoveryDataController to use @metamask/messenger (replace messagingSystem calls and publish/subscribe) and @metamask/base-controller/next types.
  • Update state metadata to StateMetadata with includeInDebugSnapshot and adjust deriveStateFromMetadata usages.
• Tests:
  • Replace getRestricted with namespaced Messenger + delegate; update imports and type utilities (MessengerActions, MessengerEvents, MOCK_ANY_NAMESPACE).
  • Adjust publish/subscribe/call sites and expectations accordingly.
• Changelogs:
  • Consolidate BREAKING note to “migrate controllers to new Messenger” and note polling-controller Messenger change.
• Misc:
  • Minor ESLint threshold adjustments; no functional logic changes beyond messenger/metadata API migration.

^{Written by Cursor Bugbot for commit 564f730. This will update automatically on new commits. Configure here.}

[mcmire]

One thing that Cursor noticed.

[mcmire]

Hmm, it does seem that we need a parent option here.

[socket-security]

No dependency changes detected. Learn more about Socket for GitHub.

👍 No dependency changes detected in pull request