* updates secret list header to display badge for all versions
* adds changelog entry
* updates secret list header to only show badge for kv and generic engine types
* adds secret-engine mirage factory
* adds test helper for pushing serialized mirage data into store and returning ember data models
* adds secret engine type version badge display test
* updates mirage application serializer to return singular type key
* Redirect to url with namespace param if user logged into root namespace without permission
* Feature flag service for managing flags
* Redirect with namespace query param if no current namespace param AND managed root namespace set
* Test coverage for managed namespace changes
* Handle null body case on feature-flag response, add pretender route for feature-flags on shamir test
