refactor: omnichannel on-hold feature (#28252)

.changeset/moody-teachers-cheer.md

apps/meteor/app/livechat/server/lib/Helper.js

apps/meteor/app/livechat/server/lib/QueueManager.js

apps/meteor/app/livechat/server/lib/RoutingManager.js

.../ComposerOmnichannel/hooks/useResumeChatOnHoldMutation.ts

apps/meteor/ee/app/livechat-enterprise/server/api/rooms.ts

...or/ee/app/livechat-enterprise/server/hooks/afterOnHold.ts

...ivechat-enterprise/server/hooks/afterOnHoldChatResumed.ts

...vechat-enterprise/server/hooks/onAgentAssignmentFailed.ts

...e/app/livechat-enterprise/server/hooks/onCloseLivechat.ts

...r/ee/app/livechat-enterprise/server/hooks/resumeOnHold.ts

.../livechat-enterprise/server/hooks/scheduleAutoTransfer.ts

apps/meteor/ee/app/livechat-enterprise/server/index.ts

...vechat-enterprise/server/lib/AutoTransferChatScheduler.ts

.../app/livechat-enterprise/server/lib/LivechatEnterprise.ts

...ivechat-enterprise/server/lib/VisitorInactivityMonitor.ts

...ee/app/livechat-enterprise/server/methods/resumeOnHold.ts

...enterprise/server/services/omnichannel.internalService.ts

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

apps/meteor/lib/callbacks.ts