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Refactor non nullable to required #1682

Job	Run time
cleanup-code (windows-latest)	16m 10s
inspect-code (ubuntu-latest)	12m 45s
build-and-test (macos-latest)	21m 10s
cleanup-code (ubuntu-latest)	10m 56s
cleanup-code (macos-latest)	14m 20s
inspect-code (macos-latest)	12m 0s
build-and-test (ubuntu-latest)	21m 44s
build-and-test (windows-latest)	30m 32s
inspect-code (windows-latest)	16m 34s
publish	0s
	2h 36m 11s

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