fix: convert network broker stopped lifecycle method to async (#31927)

.changeset/slimy-clocks-argue.md

apps/meteor/app/search/server/search.internalService.ts

apps/meteor/ee/server/NetworkBroker.ts

apps/meteor/ee/server/startup/services.ts

apps/meteor/ee/tests/unit/server/NetworkBroker.tests.ts

apps/meteor/tests/mocks/server/BrokerMocked.ts

...erver/services/messages/hooks/BeforeSaveCheckMAC.tests.ts

packages/core-services/src/LocalBroker.ts

packages/core-services/src/lib/Api.ts

packages/core-services/src/types/IApiService.ts

packages/core-services/src/types/IBroker.ts