Remove valueN columns from Results

[gregorbg]

This removes the last bit of dependencies we had on valueN: The attempt lists in Rankings and Records pages.

The idea for augmenting the data is courtesy of @FinnIckler, although I'm not entirely sure yet whether we should do the augmentation frontend- or backend-sided. I went with frontend for the time being, although this does pose challenges for the new NextJS frontend where caching works a tad bit different...

[gregorbg]

I went with augmentation in the backend instead, to facilitate sharing the logic between legacy React and NextJS.

Also, I noticed that the "many" test cases where we do update!(valueN: 123) are actually just four or five instances, all of them in the results_validators and all of them can be replaced with merging the updates into the instantiation. So yay, one less hacking hook 😄