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Refactor non nullable to required #1681

Job	Run time
cleanup-code (macos-latest)	2m 46s
inspect-code (windows-latest)	6m 8s
cleanup-code (ubuntu-latest)	2m 52s
build-and-test (windows-latest)	21m 58s
build-and-test (ubuntu-latest)	17m 58s
build-and-test (macos-latest)	19m 1s
cleanup-code (windows-latest)	5m 41s
inspect-code (ubuntu-latest)	3m 48s
inspect-code (macos-latest)	3m 22s
publish	1s
	1h 23m 35s

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