Cleanup redundant allocations and code around Comparator use #13795
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Noticed some visible allocations in CompetitiveImpactAccumulator during benchmarking and fixed the needless allocation for the comparator in that class as well as a couple other similar spots where needless classes and/or objects could easily be replaced by more lightweight solutions.
Also inlined some single use comparator constants where a class turned into a non-capturing lambda for easier readability.