ensure one-to-one mapping between dp and git repo

[amashadihossein]

In theory it is possible to have two remote git repos corresponding to a data product name and branch.

• user1 creates dp-topic1-main on github.com/user1/dp-topic1 main branch and pushes to data repo x
• user2 creates dp-topic1-main on github.com/user2/dp-topic1 main branch and pushes also to data repo x

This does not break data usage but is a bad practice as it could cause confusion. It would be helpful to warn user 2 of the existence of another code repo connected with dp-topic1 and only proceed when forced