Fix symlinks for PATH and PYTHONPATH

[smuzaffar]

backport of #9487
plus the extra commits 720bf83

This allows SCRAM to select dedicated bin and pythonpath for externals which are build for multiple archs.
This also drop py2 support for scram tools files

[smuzaffar]

test parameters:

• full_cmssw = true

[smuzaffar]

please test

[cmsbuild]

A new Pull Request was created by @smuzaffar for branch IB/CMSSW_14_2_X/master.

@aandvalenzuela, @cmsbuild, @iarspider, @smuzaffar can you please review it and eventually sign? Thanks.
@antoniovilela, @mandrenguyen, @rappoccio, @sextonkennedy you are the release manager for this.
cms-bot commands are listed here

• Backported from [DEVEL] Fix symlinks for PATH and PYTHONPATH #9487

[cmsbuild]

cms-bot internal usage

[cmsbuild]

-1

Failed Tests: UnitTests
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5860f1/42470/summary.html
COMMIT: aa158c4
CMSSW: CMSSW_14_2_X_2024-10-30-1100/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmsdist/9488/42470/install.sh to create a dev area with all the needed externals and cmssw changes.

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:

• @JHiltbrand Handle ZDC in L1TriggerObjectsTxtWriter cmssw#46538
• @smuzaffar [DQM]L1TOccupancyClient: Bug fix and fixes static analyzer warning cmssw#46442
• @mmusich use ReadPrescalesFromFile=False in the GenericTriggerEventFlag of a bunch of DQM modules cmssw#46530

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5860f1/42470/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-5860f1/42470/git-merge-result

Unit Tests

I found 1 errors in the following unit tests:

---> test testPrintTkMaps had ERRORS

Comparison Summary

Summary:

• You potentially removed 150 lines from the logs
• Reco comparison results: 9 differences found in the comparisons
• DQMHistoTests: Total files compared: 46
• DQMHistoTests: Total histograms compared: 3569372
• DQMHistoTests: Total failures: 425
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3568927
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 45 files compared)
• Checked 201 log files, 171 edm output root files, 46 DQM output files
• TriggerResults: no differences found

[smuzaffar]

+externals

unit tests failure is due to wrong unit test script https://github.com/cms-sw/cmssw/blob/master/DQM/TrackerRemapper/test/testPrintTkMaps.sh#L10

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_14_2_X/master IBs (but tests are reportedly failing). This pull request will now be reviewed by the release team before it's merged. @mandrenguyen, @sextonkennedy, @rappoccio, @antoniovilela (and backports should be raised in the release meeting by the corresponding L2)