Fix leaking of original object from ko.observableArray #3262

Job	Run time
Build all projects without errors	10m 18s
Build published projects without warnings (Release)	2m 37s
JS unit tests	1m 4s
.NET unit tests (ubuntu-latest)	2m 42s
Build published projects without warnings (Debug)	2m 39s
.NET unit tests (windows-2022)	12m 50s
UI tests (chrome, ubuntu-latest, Production, Default)	16m 47s
.NET unit tests (macOS-latest)	2m 55s
UI tests (chrome, windows-2022, Development, Default)	24m 51s
UI tests (firefox, ubuntu-latest, Development, Default)	24m 17s
UI tests (firefox, ubuntu-latest, Production, Default)	22m 40s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	23m 30s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	16m 52s
	2h 44m 2s

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