Group update notifications for the same mod
This was originally an issue made for the frontend git, but after this comment from Emmaffle, I decided to post it here instead.

Is your feature request related to a problem? Please describe.
When a mod updates more than once, I dont really care about the older updates; I just want to see what mods have updated in general.
Even after trying to dismiss duplicate notifications for the same mods, I didn't notice that fabric api was still here twice.

Describe the solution you'd like
Ideally, I would only have one notification for every mod that updates regardless of how many times they have updated
Instead of displaying like the above screenshot, mods would be ordered by most recent update, with a number saying how many times they have updated, and a button to view all the updates I have missed.

Here is a better, newer mockup I have made for the staging branch
