Banner to enable Auto DevOps when Admin logs in
When an admin logs in, it would be helpful to add a banner asking if they want to enable the Auto DevOps feature (that otherwise will be off by default). The banner should be dismissible.
This is an iteration off of https://gitlab.com/gitlab-org/gitlab-ce/issues/34777
### Design
Banner:

__edit__: text should mention "all projects"
Svg:

[autodevops-illustration.svg](/uploads/9186e04fd55057546ddc15845375151c/autodevops-illustration.svg)
Places to put it:
- Admin dashboard 
- Projects overview (will override/higher priority than customize your experience banner) 
issue