Refactor Post Experience Surveys
add new keys for outgoing open to applied
- o_sign_up_count_to_applied_count_<programme_id>
- o_sign_up_to_applied_time_<programme_id>
- total_sign_up_count_to_applied_count
- total_sign_up_to_applied_time
remove status filter
change label for Time Period to Signed Up At
change label for Time Period to Signed Up At
