Resolve "Environments dropdown is showing on the cluster health page"

What does this MR do?

Fixes the environments dropdown showing on the cluster health page

Screenshots (if relevant)

Before

Screen_Shot_2018-07-16_at_4.42.07_PM

After

Screen_Shot_2018-07-16_at_4.41.56_PM

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #6919 (closed)

Backport

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20658

Edited by Jose Ivan Vargas