Show upstream group-level protected environments in the project-level CI/CD setting page
### Release notes
Previously, there was no way to see if there are upstream group-level protected environment settings when viewing a project's configuration settings. In 15.3, you can now see these setting in the project's protected environment configuration settings.
### Problem
For the project maintainers, they have no idea whether their projects are affected by [group-level protected environments](https://docs.gitlab.com/ee/ci/environments/protected_environments.html#group-level-protected-environments). We should give them visibility that what protected environment rules are coming down from the upstream group/organization.
### Proposal
~"GitLab Premium"
See mockup.
## Implementation plan
~backend
- [ ] Return environments protected by upstream groups (for project-level view)
~frontend
- [ ] Add display for environments protected by upstream groups
issue