[PWGHF] UPC utils: Make SGSelector parameters configurable

[Rrantu]

1. The default values of NDtColl, MinNBCs, MinNTracks and MaxNTracksFix in utilsUpcHf.h were not optimal and have been changed to Configurable parameters.
2. Reduced the number of bins in the UPC QA histograms in taskLc.cxx to optimize memory usage.

[vkucera]

Hi @Rrantu , when these parameters were being added, my understanding was that these were already optimised constants taken from the UD. Can you please explain the motivation of your PR?
Btw, your changes do not modify the defaults of the SGSelector class. Fix the title.

[Rrantu]

Hi @Rrantu , when these parameters were being added, my understanding was that these were already optimised constants taken from the UD. Can you please explain the motivation of your PR? Btw, your changes do not modify the defaults of the SGSelector class. Fix the title.

Hi @vkucera, the original default values were not fully consistent with the UD configurations. I have now made these parameters configurable based on the settings used in the UD analysis.

[vkucera]

Looks good to me.

[zhangbiao-phy]

Thanks @Rrantu !