Migrate `app/views/projects/_visibility_modal.html.haml` modal implementation to `GlModal`
The markup in `app/views/projects/_visibility_modal.html.haml` replicates that of `GlModal`. It should be replaced with the implementation using `GlModal`. The modal is triggered by bootsrap's `modal` in `app/assets/javascripts/confirm_danger_modal.js`. Check [the parent epic](https://gitlab.com/groups/gitlab-org/-/epics/4386) for migration tips [Example - Update project visibility](http://127.0.0.1:3000/gitlab-org/gitlab-shell/edit) ![Screenshot_2021-10-29_at_19.02.56](/uploads/519bbf8a9001084b191e71a6d5994b9e/Screenshot_2021-10-29_at_19.02.56.png)|
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