[9.0] Fix uniquify to handle multiple successive duplicates (#126889) #126953
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CollectionUtils.uniquify is based on C++ std::unique. However, C++ iterators are not quite the same as Java iterators. In particular, advancing them only allows grabbing the value once. This commit reworks uniquify to be based on list indices instead of iterators. closes elastic#126883
rjernst
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:Core/Infra/Core
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Backports the following commits to 9.0: