v5 cleanup: Replace custom ReferenceEqualityComparer with the standard one #3275

Job	Run time
JS unit tests	1m 3s
.NET unit tests (ubuntu-latest)	2m 43s
Build published projects without warnings (Release)	1m 25s
.NET unit tests (windows-2022)	11m 13s
UI tests (chrome, ubuntu-latest, Production, Default)	14m 54s
Build all projects without errors	4m 49s
Build published projects without warnings (Debug)	1m 28s
.NET unit tests (macOS-latest)	3m 15s
UI tests (chrome, windows-2022, Development, Default)	27m 23s
UI tests (firefox, ubuntu-latest, Development, Default)	19m 20s
UI tests (firefox, ubuntu-latest, Production, Default)	18m 15s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	19m 39s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	16m 0s
	2h 21m 27s

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