[PWGHF] taskFlow.cxx: remove unused plots, remove cut, remove some CorrelationContainers

[AlexianL]

In this PR :

• I removed most of D0 and Lc candidates QA plots (I don't use them, and if needed they are in their respective HF tasks)
• I removed the cut on candidate pT added in the last PR, hoping it will make the memory consumption better and also because this cut is already available in the candidate selector task
• I removed all CorrelationContainers but 4 (keeping 2 for same and mixed event, and 2 for same and mixed event for HF correlations because of the need of using massAxis), as they are multi-dimensional objects, I hope it will make the consumption of my task better