Restore Leaderboard Endpoint

[TheTedder]

PUT /leaderboard/{id}/restore where {id} is a long.

The server must return a 401 error if the client is not authenticated.

The server must return a 403 error if the current user's role is not ADMIN.

The server must return a 404 error if the given ID does not correspond to a leaderboard in the database.

The server must return a 404 error if the given ID corresponds to a leaderboard that is not deleted.

The server may use a response body to disambiguate between the two different scenarios that can generate a 404 error.

Upon a successful restoration, the server must set the DeletedAt field of the corresponding leaderboard to null and return a 204 status code.