Merge branch '13330-gdk-error-on-non-unique-graphql-fragment-pageinfo' into 'master'

Resolve "GDK error on non-unique GraphQL fragment 'PageInfo'"

Closes #13330

See merge request gitlab-org/gitlab-ce!31532

app/assets/javascripts/graphql_shared/fragments/pageInfo.fragment.graphql

+fragment PageInfo on PageInfo {
+  hasNextPage
+  endCursor
+}

app/assets/javascripts/repository/queries/getFiles.query.graphql

+#import "~/graphql_shared/fragments/pageInfo.fragment.graphql"
+
 fragment TreeEntry on Entry {
   id
   name
@@ -5,11 +7,6 @@ fragment TreeEntry on Entry {
   type
 }
 
-fragment PageInfo on PageInfo {
-  hasNextPage
-  endCursor
-}
-
 query getFiles(
   $projectPath: ID!
   $path: String