PV fit in TBLV converges poorly
When debugging a problem with failed fits in TBLV I noticed that the fraction of poorly converging fits (more than 10 iterations to each abs(delta-z)<1 micron) is large, about 50%. I don't remember that it was like this when the code was first implemented. This possibly affects the resolution, which is why we need to worry about it.
This observation was made in the hlt2_test_duplicate_filters
test, which processes 2022 data. One may wonder if there is a difference between data and MC.
I added counters to TBLV for the fraction of failed and unconverged fits to allow further study.