[STORY] As a programme coordinator, I want a jingle being played after every 3 random music pool tracks, in order to keep the programme more dynamic and lively

For random music, there should be the option to include a Jingle every (n) tracks (FRF 3x audio, 1x jingle)

Relates to Fallback Scenario: Play Random Music #43 (closed), #13 and involves work on engine-core