[Task]: Make groups in activity list collapsible

[nicole-obrien]

Task description

To make it easier to navigate the activity list we should make the activity feed groups collapsible.

Requirements

• [ ] Design collapsible group
• [ ] Implement collapsible group

Creation checklist

• [ ] I have assigned this task to the correct people
• [X] I have added the most appropriate labels
• [X] I have linked the correct milestone and/or project