Adds feature flags for new duo developer versions

Eduardo Bonetrequested to merge
590622-add-feature-flags-for-new-developer-versions into master

What does this MR do and why?

Adds feature flags for new duo developer versions

Adds two new feature flags to control release of two duo developer versions:

  • developer_unstable is 18.11+ containing breaking changes
  • developer_next is an improved version compatible version with 18+

Changes: added EE: true

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