Fix memory use when writing ParameterSets to files [13_2]

[Dr15Jones]

PR description:

When forwarding a VPSet from the input file to the output, avoid calling vpset() which triggers creating the entire vector.

PR validation:

Code compiles.

backport of #44727

[cmsbuild]

A new Pull Request was created by @Dr15Jones for CMSSW_13_2_X.

It involves the following packages:

• FWCore/ParameterSet (core)

@makortel, @cmsbuild, @Dr15Jones, @smuzaffar can you please review it and eventually sign? Thanks.
@makortel, @wddgit, @missirol this is something you requested to watch as well.
@antoniovilela, @sextonkennedy, @rappoccio you are the release manager for this.

cms-bot commands are listed here

[cmsbuild]

cms-bot internal usage

[Dr15Jones]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-472f5f/38855/summary.html
COMMIT: bdfd19d
CMSSW: CMSSW_13_2_X_2024-04-14-0000/el8_amd64_gcc11
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/44741/38855/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 16 differences found in the comparisons
• DQMHistoTests: Total files compared: 48
• DQMHistoTests: Total histograms compared: 3198830
• DQMHistoTests: Total failures: 9
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3198799
• 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

[makortel]

+core

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_13_2_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_14_1_X is complete. This pull request will now be reviewed by the release team before it's merged. @sextonkennedy, @antoniovilela, @rappoccio (and backports should be raised in the release meeting by the corresponding L2)

[antoniovilela]

+1