refactor: migrate {AccountActivity,BackendWebSocket}Service to @metamask/messenger

[cryptodev-2s]

Explanation

This PR migrates AccountActivityService and BackendWebSocketService to the new @metamask/messenger message bus, as opposed to the one exported from @metamask/base-controller.

References

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 base-controller messenger with @metamask/messenger across core-backend services, updates types/exports, tests, dependencies, and docs with breaking changes noted.

• Core Backend Services:
  • Migrate AccountActivityService and BackendWebSocketService to @metamask/messenger (Messenger) replacing RestrictedMessenger.
  • Update messenger wiring: new root/child messengers, delegate, publish/subscribe/call usage; adjust connection, subscription, and event handling accordingly.
  • Refactor tests to use new messenger APIs and types.
• API/Types (BREAKING):
  • Remove controller-messenger-specific exported aliases/constants: BackendWebSocketServiceAllowedActions/Events, AccountActivityServiceAllowedActions/Events, ACCOUNT_ACTIVITY_SERVICE_ALLOWED_ACTIONS/ EVENTS.
  • Rename metadata property anonymous to includeInDebugSnapshot.
• Dependencies/Build:
  • Remove @metamask/base-controller; add @metamask/messenger and reference in tsconfig.
  • Bump @metamask/profile-sync-controller to ^25.1.2.
• Docs:
  • Update README dependency graph: core_backend --> messenger; add eip_7702_internal_rpc_middleware --> controller_utils.

^{Written by Cursor Bugbot for commit 1eef1b3. This will update automatically on new commits. Configure here.}

[Kriys94]

LGTM :)

[cursor]

Bug: Race Conditions in Test Asynchronous Operations

Removing await from rootMessenger.publish() calls in tests can introduce race conditions. Asynchronous event handlers triggered by the publish might not complete before subsequent assertions, potentially causing test flakiness, even with completeAsyncOperations() called afterward.

Additional Locations (6)

• packages/core-backend/src/AccountActivityService.test.ts#L723-L724
• packages/core-backend/src/AccountActivityService.test.ts#L774-L775
• packages/core-backend/src/AccountActivityService.test.ts#L804-L805
• packages/core-backend/src/AccountActivityService.test.ts#L826-L827
• packages/core-backend/src/AccountActivityService.test.ts#L866-L867
• packages/core-backend/src/AccountActivityService.test.ts#L904-L905