Migrates the AdaptiveCards .NET library from Newtonsoft.Json to System.Text.Json#9359

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Copilot wants to merge 3 commits intouser/philnach/NewtonSoftTransitivefrom

copilot/sub-pr-9357-again

Commits on Mar 6, 2026

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Copilot
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fix: incorporate PR #9358 fixes - thread safety, collection element defaults, IsVisible roundtrip

Copilot
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philnach
committed
fix: tighten IsVisible_False_RoundtripsCorrectly assertion to match exact JSON pattern

Copilot
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philnach
committed