Do not return hidden columns from the server

[jimmykodes]

Scores on leaderboards with hidden columns are still returned form the server in full and the hidden scores are filtered on the frontend, meaning the columns are not hidden to the API. They should be.

A hidden column should still be used in consideration of ranking submissions (or at least that is my opinion) but the values of those scores should not be visible to the API.

Todos:

• unpack hidden column in V1 unpacker
• do not show hidden column in leaderboard

[ihsaan-ullah]

Issues:

1. While unpacking, hidden attribute for column is not used
2. Hidden columns are returned and are shown on leaderboard

codabench/src/static/riot/competitions/detail/leaderboards.tag

Line 109 in 00f638d

if((key.includes(search_key) || title.includes(search_key)) && !column.hidden) {