Enable Style/WhileUntilDo rubocop style cop

See #17478

.rubocop.yml

@@ -705,7 +705,7 @@ Style/WhenThen:
 # Checks for redundant do after while or until.
 Style/WhileUntilDo:
-  Enabled: false
+  Enabled: true
 # Favor modifier while/until usage when you have a single-line body.
 Style/WhileUntilModifier:

app/models/network/graph.rb

@@ -231,7 +231,7 @@ module Network
       reserved.uniq!
       space = space_default
-      while reserved.include?(space) do
+      while reserved.include?(space)
         space += space_step
         if space < space_base then
           space_step *= -1

lib/gitlab/ci/build/artifacts/metadata.rb

@@ -56,7 +56,7 @@ module Gitlab
             child_pattern = '[^/]*/?$' unless @opts[:recursive]
             match_pattern = /^#{Regexp.escape(@path)}#{child_pattern}/
-            until gz.eof? do
+            until gz.eof?
               begin
                 path = read_string(gz).force_encoding('UTF-8')
                 meta = read_string(gz).force_encoding('UTF-8')