Updating UX of contextual view (drawer): Drawer design & content
## Summary
The drawer component will be added to all planning views (referenced below), however this component is not reflecting the final state design as outlined in https://gitlab.com/gitlab-org/gitlab/-/issues/409886.
This issue will itemize the UX updates needed to reach the final design state as outlined in https://gitlab.com/gitlab-org/gitlab/-/issues/409886.
### Planning views linked issues
- [Boards](https://gitlab.com/gitlab-org/gitlab/-/issues/464063)
- [Lists](https://gitlab.com/gitlab-org/gitlab/-/issues/463829)
- [Detail Page](https://gitlab.com/gitlab-org/gitlab/-/issues/444434)
- [Roadmap](https://gitlab.com/gitlab-org/gitlab/-/issues/7474)
issue