CSHARP-5749: Handle C# 14 mangling of Contains/SequenceEquals to MemoryExtensions#1790

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damieng wants to merge 5 commits intomongodb:mainfrom

damieng:csharp-5749

Commits on Oct 9, 2025

Replace MemoryExtension.Contains/SequenceEqual with Enumerable counterparts.
damieng
committed

Commits on Oct 10, 2025

Simplify calling both Partial & Compat into a new Preprocessor.
damieng
committed

Commits on Oct 14, 2025

Commits on Oct 15, 2025

CSHARP-5749: Requested changes.
rstam
committed