[14_1_X] Allow using fake pixels from the digi morphing algorithm as cluster seeds but drop them from final clusters

[ferencek]

PR description:

Backport of #46813 to CMSSW_14_1_X

[cmsbuild]

A new Pull Request was created by @ferencek for CMSSW_14_1_X.

It involves the following packages:

• RecoLocalTracker/SiPixelClusterizer (reconstruction)

@cmsbuild, @jfernan2, @mandrenguyen can you please review it and eventually sign? Thanks.
@GiacomoSguazzoni, @VinInn, @VourMa, @dkotlins, @felicepantaleo, @ferencek, @gpetruc, @missirol, @mmusich, @mroguljic, @mtosi, @rovere, @threus, @tsusa, @tvami this is something you requested to watch as well.
@antoniovilela, @mandrenguyen, @rappoccio, @sextonkennedy you are the release manager for this.

cms-bot commands are listed here

[cmsbuild]

cms-bot internal usage

[jfernan2]

please test

[jfernan2]

type bug-fix

[cmsbuild]

+1

Size: This PR adds an extra 20KB to repository
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-c702c7/43133/summary.html
COMMIT: a0cfbb2
CMSSW: CMSSW_14_1_X_2024-11-28-1100/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/46816/43133/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially added 3 lines to the logs
• Reco comparison results: 12 differences found in the comparisons
• DQMHistoTests: Total files compared: 46
• DQMHistoTests: Total histograms compared: 3565709
• DQMHistoTests: Total failures: 6
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3565683
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 45 files compared)
• Checked 199 log files, 169 edm output root files, 46 DQM output files
• TriggerResults: no differences found

[jfernan2]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_14_1_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_15_0_X is complete. This pull request will now be reviewed by the release team before it's merged. @sextonkennedy, @antoniovilela, @rappoccio, @mandrenguyen (and backports should be raised in the release meeting by the corresponding L2)

[mandrenguyen]

hold
The master must have changed, since this was merged in 15_0_X. We should have a 14_2_X backport.

[cmsbuild]

Pull request has been put on hold by @mandrenguyen
They need to issue an unhold command to remove the hold state or L1 can unhold it for all