Fix leaking of original object from ko.observableArray #3267

Job	Run time
Build all projects without errors	11m 37s
JS unit tests	1m 2s
.NET unit tests (ubuntu-latest)	2m 48s
Build published projects without warnings (Release)	5m 16s
.NET unit tests (windows-2022)	9m 8s
Build published projects without warnings (Debug)	2m 47s
UI tests (chrome, ubuntu-latest, Production, Default)	16m 55s
.NET unit tests (macOS-latest)	7m 10s
UI tests (chrome, windows-2022, Development, Default)	25m 33s
UI tests (firefox, ubuntu-latest, Development, Default)	23m 6s
UI tests (firefox, ubuntu-latest, Production, Default)	21m 28s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	22m 52s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	18m 28s
	2h 48m 10s

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