Bds2KstKstb Add MC DST Lb sample

This Analysis Production adds an additional MC sample for the Bds2KstKstb analysis.

An additional Lb background MC sample is added for Lb -> (Lc+ -> p K- pi+) pi- with event type 15364010. This sample is full DST and is required as the current Lb MC samples are both MDST and so the isolation variables used in the selection process are not present in them. This full DST Lb sample can therefore be used as a proxy for the MDST Lb samples. The new Lb sample is also re-stripped to remove stripping line PID cuts (the same as all of the existing DST MC samples).