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Refactor non nullable to required #1679

Job	Run time
build-and-test (macos-latest)	17m 58s
cleanup-code (ubuntu-latest)	10m 55s
inspect-code (ubuntu-latest)	12m 30s
cleanup-code (macos-latest)	13m 10s
build-and-test (windows-latest)	31m 39s
build-and-test (ubuntu-latest)	23m 36s
cleanup-code (windows-latest)	15m 35s
inspect-code (macos-latest)	11m 39s
inspect-code (windows-latest)	15m 58s
publish	0s
	2h 33m 0s

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