Revert "Remove EnableDockerUserNamespaceRemap from test step"
Revert "Remove EnableDockerUserNamespaceRemap from test step"

This reverts commit a28b2f318bd4e2935f2e6f0cb1bd11753d1e0ae0.

holmesjr/elastic-ci-stack-for-aws,holmesjr/elastic-ci-stack-for-aws,buildkite/elastic-ci-stack-for-aws