Add `sign_in` and `unlock` to reserved names
Problem to solve
Similar to oauth
being reserved, other path elements related to authentication should also be reserved: sign_in
and unlock
.
Intended users
All users
Permissions and Security
None.
Documentation
https://docs.gitlab.com/ee/user/reserved_names.html will need to be update.
Testing
User should not be able to create accounts with those names or change existing accounts to use those names.