Add ability to see project deployments at cluster level (FE)

What does this MR do?

This adds the ability to see project-level deployments using a group-level cluster

Issue: https://gitlab.com/gitlab-org/gitlab-ee/issues/13392

Does this MR meet the acceptance criteria?

Conformity

• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Style guides

Performance and testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers