Add support for new User status blocked_pending_approval

[TheKas]

Since GitLab version 13.7 users have after a new registration the status
state: "blocked_pending_approval"

But this is currently not implemented

sources:

• https://docs.gitlab.com/ee/user/admin_area/moderate_users.html#users-pending-approval
• https://docs.gitlab.com/ee/api/users.html#approve-user
• https://docs.gitlab.com/ee/api/users.html#reject-user

[TheKas]

PR: #1280