Dotty

Refactor config.MigrationVersion (#21399) #32185

Job	Run time
test	54m 28s
test_non_bootstrapped	28m 2s
test_scala2_library_tasty	0s
test_windows_fast	0s
community_build_a	40m 11s
community_build_b	1h 26m 5s
MiMa	12m 17s
test_windows_full	1h 2m 45s
test_sbt	15m 2s
build-msi-package	0s
community_build_c	1h 3m 25s
test_java8	0s
build-sdk-package / build	7m 52s
build-chocolatey-package / build	16s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	6h 10m 23s

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