Note

Migrates remaining assets controllers and tests from base-controller messenger to @metamask/messenger, updating metadata APIs and messaging calls.

• Assets Controllers migration
  • Switch MultichainAssetsController, MultichainBalancesController, NftDetectionController, RatesController, and TokenSearchDiscoveryDataController (and related types) to @metamask/messenger.
  • Replace RestrictedMessenger with Messenger; update calls from messagingSystem.* to messenger.* (publish, subscribe, call).
  • Move imports to @metamask/base-controller/next; adopt StateMetadata and includeInDebugSnapshot in controller metadata.
  • Adjust event/action types (e.g., MessengerActions, MessengerEvents), and messenger construction (root/delegated namespaces) in tests.
• RatesController
  • Update metadata to use includeInDebugSnapshot; keep polling events (pollingStarted/pollingStopped) publishing via new messenger.
• Tests
  • Refactor tests to use namespaced root messengers and delegate APIs; update deriveStateFromMetadata calls to includeInDebugSnapshot.
• Changelog
  • Consolidate BREAKING note: controllers migrated to new Messenger (adds PR references).
• Misc
  • Update ESLint warning thresholds.

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