Improve performance of artifact conflict detection. * Use the action count to presize data structures that grow with the number of outputs. * Short-circuit output registration when detecting that actions can be shared - there is no need to check for each output, since shareable actions must have identical outputs. * Instead of using `ConcurrentSkipListMap` to order and deduplicate artifacts, aggregate all artifacts in a list and use `Arrays.parallelSort` followed by a length check to skip calling `startsWith` on equal exec paths. PiperOrigin-RevId: 379403122
{Fast, Correct} - Choose two
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