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What's the problem this PR addresses?
Even if the check isn't run as part of PRs, it still takes almost 4 hours, and if we used shards we'd still use the same amount of CI minutes but everything would finish faster.
How did you fix it?
Made it use 4 shards. More than that would result in diminishing returns compared to the number of extra CI checks it creates.
If anybody considers these 4 checks too much we can also try 3, since it would be around 1 hour and 15 minutes each, which is still a lot better than 4 or 2.
Checklist