Upgrade @gitlab/ui to v12

Paul Gascou-Vaillancourtrequested to merge
rename-gl-new-button-to-gl-button into master

Integration MR for gitlab-ui!1291 (merged)

  • Upgraded @gitlab/ui to v12.0.0.
  • Migrated GlNewButton to GlButton.
Edited by Paul Gascou-Vaillancourt

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