Draft : Upsilon -> ll

patch generated by https://gitlab.cern.ch/lhcb/Moore/-/jobs/18533986

This is the first version of a work in progress to enable the analysis of upsilon -> ll (ee, mumu, tautau, mutau, etau) in run3. Of course the hope is that a code review will highlight both the code issues and any issues with the current default cuts applied.

Note that upsilon -> emu is already a part of the qqbar->emu lines.

The bits of code that have been added :

1. New file rd/upsilon_to_ll.py - contains the trigger lines for the above mentioned lines.
2. Update of rd/builders/qqbar_builder.py to contain the relevant make_... functions make_prompt_mumu make_prompt_ee make_prompt_tautau make_prompt_etau make_prompt_mutau

Thanks and Cheers, Raja (and Fergus).