Design activity is not showing up on the activity graph

Summary

When viewing the user profile activity, the heatmap of activity is not showing design activity.

Steps to reproduce

• Upload a new design or a revision to a design
• The activity is present in the user profile page
• The activity is not on the heatmap

What is the expected correct behavior?

• Upload a new design or a revision
• The activity is present in the user profile
• The activity is present on the heatmap

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com

Possible fixes

Change the definition of contributions in Event.contributions and ContributionCalendar to include creating designs.