Remove unused feature flag mixin after protected packages release
requested to merge 472655-test-and-rollout-the-protected-npm-packages-feature-clean-mixin into master
What does this MR do and why?
Release protected npm packages feature (!169246 - merged) removed code related to feature flag, but missed removing the imported feature flag mixin.
This MR addresses that.
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Related to #472655 (closed)