### Problem Some of our In progress/loading states are still using default Bootstrap spinners v.s our [current spinners](https://design.gitlab.com/components/spinner) listed in Pajamas. This issue is an attempt at tracking and listing them. ### Proposal * Migrate Bootstrap spinners to Pajamas spinners. ### Example Issue sidebar when expanded.  ### List * [ ] Issue sidebar * [ ] Assignee * [ ] Milestone * [ ] Labels * [ ] [Activity page](https://gitlab.com/dashboard/activity) * [ ] [Milestones page](https://gitlab.com/dashboard/milestones). Use the dropdown for "select project to create a milestone" * [ ] Issue creation * [ ] Assignee * [ ] Milestone * [ ] Labels * [ ] _Add any?_