Revert "Powheg+Vincia matching"

[mseidel42]

This reverts commit 1c80a7d.

PR description:

Not needed anymore for Pythia 8.309:

The PowhegHooks now work with all three shower models and automatically switch between the simple shower, Vincia, and Dire based on the PartonShowers:model mode. In addition, the option to set POWHEG:nFinal = -1 has been ported from 8.244 to allow the use of event files with a variable number of real emissions.

cms-sw/cmsdist#8552

PR validation:

Compiles, should not affect any workflow.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-42020/35980

• This PR adds an extra 16KB to repository

[cmsbuild]

A new Pull Request was created by @mseidel42 (Markus Seidel) for master.

It involves the following packages:

• GeneratorInterface/Pythia8Interface (generators)

@SiewYan, @mkirsano, @Saptaparna, @cmsbuild, @alberto-sanchez, @menglu21, @GurpreetSinghChahal can you please review it and eventually sign? Thanks.
@alberto-sanchez, @mkirsano this is something you requested to watch as well.
@perrotta, @dpiparo, @rappoccio you are the release manager for this.

cms-bot commands are listed here

[menglu21]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-b877f3/33264/summary.html
COMMIT: 4f84c8a
CMSSW: CMSSW_13_2_X_2023-06-19-2300/el8_amd64_gcc11
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/42020/33264/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially added 11 lines to the logs
• Reco comparison results: 12 differences found in the comparisons
• DQMHistoTests: Total files compared: 48
• DQMHistoTests: Total histograms compared: 3197958
• DQMHistoTests: Total failures: 9
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3197927
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 47 files compared)
• Checked 207 log files, 159 edm output root files, 48 DQM output files
• TriggerResults: no differences found

[smuzaffar]

@perrotta @rappoccio this PR is also needed by cms-sw/cmsdist#8552

[smuzaffar]

@cms-sw/generators-l2 can you please review/sign this? The pythia8 309 has already been merged without this PR and now IBs are broken.

[smuzaffar]

@perrotta @rappoccio for now I have stopped building 11h00 IB for 13.2.X ( as it will be broken without this PR). Once it is merged then I will trigger the build for 13.2.X IB

[rappoccio]

+1

[rappoccio]

merge

[rappoccio]

• Bypassing generators signature to fix the IBs, this was supposed to be merged along with the new Pythia version (my fault, apologies!)