`repositoryName` field is incorrectly formatted during import flow

[jacobsfletch]

The repositoryName field is incorrectly appending the team name to the chosen repo name, i.e. my-team-my-repo instead of my-repo. This field will longer be saved to the db, so we need to not only fix this improper formatting, but also adjust the code accordingly, like extract the value from the repositoryFullName where needed.