Make "Stateless" mode sessionless #750

Job	Run time
build (macos-latest, Debug)	2m 15s
build (windows-latest, Release)	5m 58s
build (windows-latest, Debug)	5m 18s
build (ubuntu-latest, Release)	3m 18s
build (macos-latest, Release)	3m 42s
build (ubuntu-latest, Debug)	3m 28s
publish-coverage / publish-coverage	47s
	24m 46s

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