Merge branch 'ignore_migrations_2018' into 'master'

Ignore migrations 2018 onwards

See merge request gitlab-org/gitlab!38247

.gitignore

@@ -383,4 +383,224 @@ db/schema_migrations/20181219145521
 db/schema_migrations/20190225160300
 # Removed in 44f9d16edca328e5bb234b853f0d670ee0b30a26
 db/schema_migrations/20200615101135
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+# Removed in ef1efa0f650
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+# Removed in 28ac2d30498
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+# Removed in b87dcc238a8
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+# Removed in various revert commits
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