Fix scrolling tabs on activity view
What does this MR do and why?
Fixes scrolling tabs on activity view (both project overview and project activity pages)
Screenshots or screen recordings
| Before | After | |
|---|---|---|
| Project overview |  |
 |
| Project activity |  |
 |
How to set up and validate locally
Project overview
- Enable
:project_overview_reorg - Go to personal preferences > Project overview content > Activity
- View project overview page, size screen down
Project activity (http://127.0.0.1:3000/gitlab-org/gitlab-test/activity)
- Size screen down, observe scrolling tabs