Duplicate rate increase at high pt

[areinsvo]

This GH issue is a followup issue to issue #248. When studying the efficiency loss at high pt, it was discovered that fixing the negative entries in the covariance matrix led to an increase in the duplicate rate. More generally, using the high pt 10μ sample indicated that the duplicate rate grows dramatically with pt and at high eta. For pt < 100 GeV the duplicate rate is ~2% and for pt > 500 the duplicate rate is 20%. We might need a high-pt retuning of the duplicate removal parameters.

Musings from Matevz regarding the increase after the covariance matrix fix PR250: There is a possibility that we have a fit that is poorly constrained and so the result is somewhat "random". If this is indeed the case, seeds from the set of hits belonging to the same mc-track would lead to drastically different parameters and there's no way to clean those out on track parameter consideration.