[8_0_X] Make sure to report an error if process.options.numberOfThreads has wrong type

[makortel]

PR description:

Backport of #41349, title says it all. Contrary to the other backports, I did not include the unit tests here, because apparently 8_0_X does not support the <test ...> syntax for defining unit tests, and therefore making them functional would have required quite some work (that I would not want to do).

PR validation:

Code compiles.

If this PR is a backport please specify the original PR and why you need to backport that PR. If this PR will be backported please specify to which release cycle the backport is meant for:

Backport of #41349

[cmsbuild]

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

It involves the following packages:

• FWCore/Framework (core)

@cmsbuild, @smuzaffar, @Dr15Jones, @makortel can you please review it and eventually sign? Thanks.
@missirol, @wddgit 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

[makortel]

@cmsbuild, please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-79d31c/32724/summary.html
COMMIT: 634de99
CMSSW: CMSSW_8_0_X_2023-05-14-0000/slc6_amd64_gcc530
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/41735/32724/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially removed 5 lines from the logs
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 15
• DQMHistoTests: Total histograms compared: 1044635
• DQMHistoTests: Total failures: 871
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 1043656
• DQMHistoTests: Total skipped: 108
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -14 KiB( 14 files compared)
• Checked 62 log files, 40 edm output root files, 15 DQM output files

[makortel]

Differences are similar to as reported in #40708 (comment), and are unrelated to this PR

[makortel]

+core

[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) and once validation in the development release cycle CMSSW_13_2_X is complete. This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @rappoccio (and backports should be raised in the release meeting by the corresponding L2)

[perrotta]

+1