Simple masking frontend - CE

What does this MR do?

Original MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25476 Revert: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/26684

MR was merged but then caused EE tests to fail, new CE and EE versions were made

The first commit has all of the changes from the original MR, the second has the fix.

This should fix the issues in EE, since the EE version is identical and the pipeline is green.

EE version: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/10495

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/10738 https://gitlab.com/gitlab-org/gitlab-ee/issues/10740