Use the new :up migration testing rake task

Simon Tomlinsonrequested to merge
stomlinson/new-migration-structure into master

In gitlab-org/gitlab!71111 (merged), we switched to gitlab:db:migration_testing:up and gitlab:db:migration_testing:down rake tasks, and an associated new directory structure. This MR switches to gitlab:db:migration_testing:up in the testing pipeline, so that we can remove the old gitlab:db:migration_testing rake task.

Relates to #18 (closed)

Edited by Simon Tomlinson

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