Remove commented _isNewGameCommandSupported #4561

Job	Run time
long-running-tests (ubuntu-latest, LongRunning)	1m 31s
make-build (ubuntu-latest)	45s
long-running-tests (windows-latest, LongRunning)	5m 18s
make-build (macOS-latest)	52s
build-and-publish (ubuntu-latest)	48s
make-build (macOS-13)	1m 1s
long-running-tests (macOS-latest, LongRunning)	2m 1s
fast-tests (Debug, ubuntu-latest)	1m 8s
build-and-publish (windows-latest)	3m 15s
long-running-tests (macOS-13, LongRunning)	2m 6s
fast-tests (Debug, windows-latest)	3m 49s
build-and-publish (macOS-latest)	56s
fast-tests (Debug, macOS-latest)	1m 23s
build-and-publish (macOS-13)	1m 11s
other-tests (ubuntu-latest, Configuration)	39s
fast-tests (Debug, macOS-13)	2m 35s
other-tests (windows-latest, Configuration)	2m 9s
fast-tests (Release, ubuntu-latest)	1m 16s
perft-tests (ubuntu-latest, Perft)	4m 23s
other-tests (macOS-latest, Configuration)	45s
fast-tests (Release, windows-latest)	5m 6s
perft-tests (windows-latest, Perft)	5m 37s
fast-tests (Release, macOS-latest)	1m 38s
winning-at-chess (ubuntu-latest, WinningAtChess_FixedTime)	2m 36s
perft-tests (macOS-latest, Perft)	3m 16s
fast-tests (Release, macOS-13)	3m 47s
other-tests (macOS-13, Configuration)	1m 2s
	1h 0m 53s

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