[IMPROVE] Refactor Omnichannel Office Hours feature (#17824)

* Change omnichannel office hours data structure

* Rename omnichannel office hours templates

* Renaming things from office hour to business hour

* Partially remove LivechatOfficeHour model

* remove obsolete setting

* Remove settings from the template

* Add support to cron jobs on omnichannel business hours

* Add dynamic template to omnichannel business hours

* Open and close business hours

* Remove references to LivechatOfficeHours

* Open and close business hour automatically on startup and setting changes

* Improve open and close business hours process

* Removing separated interfaces

* Apply suggestions from review

* Changing pt-br term

* General improvements on business hour layout

* Apply suggestions from review

* Remove online verification

* Change data structure

* Ignore if collection does not exist

Co-authored-by: Renato Becker <renato.augusto.becker@gmail.com>