Insert duplication confirmation and a warning that the user is being redirected to the newly created policy

[manrodrigues]

When policy is duplicated from the button inside policy view, I miss some span or something else that make explicit to the user that the policy was successfully duplicated and the user is being redirected to the new policy page. The names are very similar and it can make users confused.

Originally posted by @manrodrigues in #1544 (comment)