refactor: use scheduler to copy firebase users

[IfyNdu]

Status	Type	Env Vars Change	Ticket
Ready	Refactor	No	N/A

Problem

A means to copy firebase users over to mongodb

Solution

Configured firebase scheduler to run at 06:00 on day-of-month 10 in October 0 6 10 10 *.

QA

• [x] Unit testing with jest