Fix validation for schedule
- Need to be != 0. Same as hoursBy. https://prnt.sc/115alwe
- Should have validation for min-items quantity (1) in array if start & endDate filled. https://prnt.sc/1162vgu
- Plz fix overlap by days https://prnt.sc/116esa6 in this list
- https://prnt.sc/116ens2 Fix this error message. Export all error message to @Vasyl.Skab.
- https://prnt.sc/116f1qv Need make startDate + endDate fields not required.