Add feature flag type licensed (RUN AS-IF-FOSS)

What does this MR do?

Related to: #30228 (closed)

Resolves: #221055 (closed)

Builds and is based on top of:

• !34269 (merged).
• !34274 (merged)

This adds a feature flag type :licensed.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Style guides