Add --namespace option to Feature command

Fabio Pitinorequested to merge
add-namespace-to-feature-command into master

Related to gitlab-org/gitlab#353117 (closed)

In gitlab-org/gitlab!79555 (merged) we allowed features API to take in input a namespace as actor.

In this MR we allow --namespace to be provided when setting a feature flag. This actor allows to use both groups as well as user namespaces.

Edited by Fabio Pitino

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