Can we get rid of https://about.staging.gitlab.com/ entirely?

The staging environment and its deploy job continues to add extra complexity for the work @cwoolley-gitlab is doing in the CI file related to #8302 (closed) has been removed from the CI/CD deploy process and has not been updated for years.

Is it possible to have redirect testing done via the review app?

Are testing redirects the only reason staging is used? Let's identify who, when, and why the staging area is used. Because every MR fires up it's own dedicated review app, seems that we may be able to remove the staging URL entirely.

The staging URL: https://about.staging.gitlab.com/

Related #8337 (closed) Related #8302 (closed)