Automatically add labels, webhook, wiki rules

[jmgasper]

When a new project is added in Project Management, we should automatically add the labels, webhook, and wiki rules, instead of forcing the user to go into the Edit a project page and click each button.

When doing this, we need to ensure the process is "robust", meaning that it should properly handle the case where labels, webhook, or wiki rules already exist, skipping them if they are already on a given repository.

The success message shown to the user should also be changed to say something like: "Project has been added successfully, and Topcoder X issue labels, webhook, and wiki rules have been added to the repository".

Please ensure you test this functionality for both Gitlab and Github.