fix(text-json): JsonArray/JsonObject enumeration is fail-fast (#1889) #410

Job	Run time
Full compatibility build	12m 8s
Net.WebSockets	1m 13s
Doxygen warning baseline	1m 6s
IO.IsolatedStorage	53s
Net.Http.Headers	1m 21s
Text.Json	1m 31s
IO.Compression	52s
Xml.Linq	1m 8s
Security.Cryptography.Random	41s
IO.Compression.Zip	49s
Core.Base	3m 34s
	25m 16s

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