fix: infer discriminator key if set in $set with overwriteDiscriminatorKey
#15243
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Re: #15218
Summary
From #15040, we infer discriminator key when casting the update if we have
TestModel.updateOne({}, { discriminatorKey })but notTestModel.updateOne({}, { $set: { discriminatorKey } }). This PR checks the$setcase. I ran into this issue while testing potential workarounds for #15218.Examples