refactor: `LivechatDepartments` - 1/2 (#28664)

apps/meteor/app/apps/server/bridges/livechat.ts

apps/meteor/app/apps/server/converters/departments.js

apps/meteor/app/apps/server/converters/rooms.js

apps/meteor/app/livechat/imports/server/rest/inquiries.ts

apps/meteor/app/livechat/imports/server/rest/sms.js

apps/meteor/app/livechat/server/api/lib/livechat.ts

apps/meteor/app/livechat/server/api/v1/offlineMessage.ts

...teor/app/livechat/server/hooks/offlineMessageToChannel.js

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

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

.../meteor/app/livechat/server/methods/sendOfflineMessage.ts

apps/meteor/app/models/server/models/LivechatDepartment.js

...app/canned-responses/server/methods/saveCannedResponse.ts

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

...t-enterprise/server/hooks/afterForwardChatToDepartment.ts

...rprise/server/hooks/applySimultaneousChatsRestrictions.ts

...-enterprise/server/hooks/beforeForwardRoomToDepartment.ts

...prise/server/hooks/onLoadForwardDepartmentRestrictions.ts

apps/meteor/lib/callbacks.ts

...ages/model-typings/src/models/ILivechatDepartmentModel.ts