perf: Use LinkedHashSet instead of List in StaticCluster

[YegorKozlov]

Patch for #917

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[YegorKozlov]

@googlebot I signed it! чт, 8 июл. 2021 г., 12:48 google-cla[bot] ***@***.***>:

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[barbeau]

Thanks @YegorKozlov for pointing this out! And yes, I believe it does need to be a LinkedHashSet, because we already had an issue with the cluster contents shifting on re-cluster if insert order isn't maintained in other data structures (see #624).

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