Widen skolem types when adding parent refinements #34225

Job	Run time
test	53m 45s
MiMa	11m 7s
community_build_a	51m 42s
test_non_bootstrapped	0s
test_scala2_library_tasty	0s
test_windows_full	0s
test_windows_fast	32m 32s
community_build_b	1h 29m 27s
community_build_c	1h 1m 17s
test_sbt	19m 12s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	7m 35s
test-msi-package	0s
build-chocolatey-package / build	21s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 26m 58s

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