Make named tuples an experimental feature again #33412

Job	Run time
test	53m 24s
test_non_bootstrapped	0s
test_windows_fast	45m 2s
test_scala2_library_tasty	0s
MiMa	11m 23s
test_windows_full	0s
community_build_b	1h 30m 37s
community_build_a	55m 15s
community_build_c	1h 7m 6s
test_sbt	19m 41s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	7m 20s
test-msi-package	0s
build-chocolatey-package / build	18s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 50m 6s

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