support XOR operator in triggerExpression::Parser

[missirol]

PR description:

This PR adds supports for the logical operator XOR in the triggerExpression::Parser class used by HLT (used most notably in the TriggerResultsFilter plugin).

The XOR evaluator was actually implemented already (class: OperatorXor); it's just that the Parser was not aware of it.

Unit tests are updated accordingly.

Except for unit tests, this new functionality remains for now unused in any central workflow.

Merely technical. No changes expected.

PR validation:

Improved unit tests pass.

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:

CMSSW_12_4_X
CMSSW_12_5_X

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-39377/32083

• This PR adds an extra 20KB to repository

[cmsbuild]

A new Pull Request was created by @missirol (Marino Missiroli) for master.

It involves the following packages:

• HLTrigger/HLTcore (hlt)
• HLTrigger/HLTfilters (hlt)

@cmsbuild, @missirol, @Martin-Grunewald can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @silviodonato, @fwyzard 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

[missirol]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-cc54a9/27496/summary.html
COMMIT: e09de73
CMSSW: CMSSW_12_6_X_2022-09-12-2300/el8_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/39377/27496/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: 3 differences found in the comparisons
• DQMHistoTests: Total files compared: 51
• DQMHistoTests: Total histograms compared: 3618326
• DQMHistoTests: Total failures: 5
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3618299
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 50 files compared)
• Checked 212 log files, 49 edm output root files, 51 DQM output files
• TriggerResults: no differences found

[missirol]

+hlt

• adds support for a new, still unused, feature (XOR operator in trigger-results expressions)
• no changes to any existing wfs
• backported to earlier active release cycles in case of need for HLT online operations (and to keep HLTcore/ sync'd across those releases as much as possible)

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). 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