Convert duration_badge to use GlBadge

What does this MR do?

This changes the duration_badge.vue to use the GlBadge component from GitLab-ui

#300696 (closed)

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Before	After

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content