Send reminders on incompleted onboarding survey

[Mehonoshin]

Value
As a newly registered member, with incompleted onboarding survey, I want to receive reminders for that.

Possible solution
It can be implemented in a similar manner, as we do for incomplete screening.
The only difference is that we want to have a smarter query, which keeps track of sent notifications.
For example, every next notification should be sent later than the previous one.
First - in 3 days after registration.
Second - in 5 days.
Third - in 10 days.
etc.
Sidekiq has similar logic for jobs retrying, you can look for example at https://github.com/mperham/sidekiq/blob/master/lib/sidekiq/job_retry.rb#L217