Force MultiThreaded execution mode and remove SingleThread option #1655

Job	Run time
Test (Windows, windows-latest, MultiThreaded)	2h 0m 8s
Test (Linux, ubuntu-latest, MultiThreaded)	1h 4m 56s
Code Quality	11m 52s
Build only (Android)	12m 38s
Build only (iOS)	4m 14s
Test results	9s
	3h 33m 57s

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