Ensure visual consistency across spinner components
### 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. ![image](/uploads/014fc65657da533b8559a4ecefea9291/image.png) ### List Overview of usage [here](https://leipert-projects.gitlab.io/is-gitlab-pretty-yet/icons/) * [ ] 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?_
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