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Refactor non nullable to required #1680

Job	Run time
cleanup-code (macos-latest)	3m 11s
inspect-code (ubuntu-latest)	12m 26s
cleanup-code (windows-latest)	5m 48s
build-and-test (windows-latest)	18m 19s
inspect-code (macos-latest)	5m 9s
cleanup-code (ubuntu-latest)	2m 45s
build-and-test (macos-latest)	13m 38s
build-and-test (ubuntu-latest)	13m 34s
inspect-code (windows-latest)	5m 55s
publish	1s
	1h 20m 46s

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