Add `default_enabled_if_undefined:` to `Feat.enabled?` to use if no YAML
What does this MR do and why?
Since all feature flags should YAML, and some of them might not
the default_enabled_if_undefined: should be used in conjunction with type: :undefined
to indicate that a given feature flag if missing should use
the value of default_enabled_if_undefined:
Related:
MR acceptance checklist
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Edited by Kamil Trzciński