CSHARP-5587: FindOneAndUpdate should insert correct discriminator value on upsert#1691

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rstam wants to merge 2 commits intomongodb:mainfrom

rstam:csharp5587

Commits on May 15, 2025

CSHARP-5587: FindOneAndUpdate should insert correct discriminator value on upsert
rstam
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Commits on May 28, 2025

CSHARP-5587: Change tests to use BeEquivalentTo.
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