chore: expand benchmark iterations

[trueadm]

I want to keep us better aligned with the official benchmark which also uses 1000 iterations, rather than 100.

https://github.com/milomg/js-reactivity-benchmark/blob/main/src/kairoBench.ts#L36

We couldn't do this before because our old signal implementation was too slow and it added on several minutes to the the CI time, but we can now since we fixed those perf issues many months ago. This will help with tuning our existing implementation too – as the number of iterations will better reflect the overhead.

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