Another fix to TrackingVertex->TrackingParticle links in premixing

[makortel]

Validation of 760 revealed that even with #11854 there are some problems left in TrackingParticle<->TrackingVertex refs
https://hypernews.cern.ch/HyperNews/CMS/get/relval/4261/13.html
This PR provides two additional fixes

• Fix the refs also for the signal event (Fix TrackingVertex->TrackingParticle links in premixing #11854 did it only for the pileup events)
• When fixing the refs for pileup events, do it only for pileup TrackingVertex objects

Tested in 760 with wfs 250199+250202.0 (latter manually configured to use the output of the former for premixed pileup events). Expecting differences in all validation plots using the TrackingParticles via TrackingVertex, e.g.

• in primary vertex validation anything vs. TrackingVertex sum(pT^2)
• in V0 validation, K0/Lambda fake rate

[cmsbuild]

A new Pull Request was created by @makortel (Matti Kortelainen) for CMSSW_8_0_X.

It involves the following packages:

SimGeneral/DataMixingModule

@cmsbuild, @civanch, @mdhildreth, @davidlange6 can you please review it and eventually sign? Thanks.
@wmtan this is something you requested to watch as well.

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@Degano you are the release manager for this.
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[civanch]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/9676/console

[cmsbuild]

+1
Tested at: 098e5b4
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12391/9676/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12391/9676/summary.html

[civanch]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_0_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar