Number of Entries incorrect

[hzxie]

Although discussed in #965, the values in the "entries" column in the leaderboard are still incorrect.
All users have "entries" equal to 1.

Ref: https://www.codabench.org/competitions/5726/#/results-tab

[ObadaS]

Hello,
This is a known issue. It used to work, but we had to disable it again because the way it was implemented made the website very slow.
It was disabled in this PR #1673

This is the main issue about slow loading pages, where we keep track of what is yet to be done : #1327

We do need to warn people that this feature is currently not working though, either by removing the column until we fix, or adding something that show when you hover over it.

[Didayolo]

I close this issue to keep track of it only on #1327.

Let's resolve this soon.