Dotty

Only nullfiy simple kinded types #37282

Job	Run time
test	48m 49s
test_windows_fast	30m 26s
community_build_c	1h 9m 0s
community_build_b	1h 12m 49s
MiMa	4m 19s
test_sbt	17m 36s
community_build_a	47m 46s
build-sdk-package / build	10m 32s
test_windows_full	0s
test_non_bootstrapped	0s
build-msi-package	0s
test-msi-package	0s
build-chocolatey-package / build	27s
test-chocolatey-package	0s
publish_release	0s
	5h 1m 44s

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