Make Vacancy sample data more realistic

1) Right now Stages per Vacancy is sorted on random order and count in total, which results onto some Vacancy with one or few stage(s) on any order like Manager Interview > Apply which makes no sense.
2) Populate Application cases with other activities of type Comment, Email, Change Case Status etc. other then native activities
3) Vacancy created_date and its applying date range should belong to this year +- 6months
4) Realistic Vacancy Description, Requirements and Benefits