v8.0.0-rc.14-dev.16: Fix nullable Mongo list container validation (#30568)

发生了什么

Linked issue Follow-up to #30051 , found during fresh consumer QA. No Linear ticket, per the original project direction. At a glance optionalStrings String[]? optionalNullableStrings String?[]? Both fields now admit an explicit null container in Mongo; only the second admits null elements. Previously, omission worked but an explicit null container failed database validation. Summary Make Mongo collection validation…

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