Gitlab Pages site not archiving with project

Summary

After a project is archived, the Pages site the project deployed is still available. The Pages site should be deleted when a project is archived or at least given an option with the default deleting the Pages site.

Steps to reproduce

• Deploy a Pages site from a project
• Archive project
• See that Pages site is still available

Workaround

1. visit Settings -> Pages
2. remove pages

What is the current bug behavior?

After a project is archived the Pages site is still accessible

What is the expected correct behavior?

The Pages site to be deleted when a project is archived

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

Remove pages once project is being archived. I think it's an excellent opportunity to use new https://docs.gitlab.com/ee/development/event_store.html.