|   o Code simplification and refactoring:    - Refactor circuit_predict_and_launch_new for readability and      testability. Closes ticket 18873.    - Extract magic numbers in circuituse.c into defined variables.    - Refactor circuit_is_available_for_use to remove unnecessary check.  o Minor features (unit tests):    - Extract dummy_origin_circuit_new so it can be used by other test      functions.    - Add unit tests circuit_predict_and_launch_new.
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