Added JVT moment to FTK jet collections, some monitoring hists

FTK/FTKRefit jet collections will now get JVT computed. Validated that this is written to AOD and implemented a couple of monitoring histograms that have been verified in AOD->NTUP_PHYSVAL.

In the process, I made a couple of other minor fixes:

• Change HTLJetMonTool behaviour to warn if a jet collection is not found, but proceed with filling histograms for all collections that have been found. This facilitates testing of a few chains at a time, and will forestall cases where a single collection was misconfigured, leading to all of the jet monitoring being disabled.
• Corrected typos in jet v8 menu additions
• Removed unused variables from JetVertexTaggerTool

FYI @ckaldero @emendesg

(Partially) addresses ATR-19217, builds on ATR-16020

Tagged for sweep to master, but that will most likely fail...