[SCRAMV1] Fix for PGO/Multivec env setup

[smuzaffar]

This fixes the issue [a] where scram sets/reset env variable value if it generated multiple time from the hook script. This only effects multi-vectorizations latest builds where CMSSW_CPU_TYPE is generated multiple time for PGO build

[a]

> export USER_SCRAM_TARGET=auto   
> cmsenv
> echo $CMSSW_CPU_TYPE $SCRAM_TARGET
scram_haswell auto
> cmsenv
> echo $CMSSW_CPU_TYPE $SCRAM_TARGET
default auto
> cmsenv
> echo $CMSSW_CPU_TYPE $SCRAM_TARGET
scram_haswell auto

[smuzaffar]

please test

[cmsbuild]

A new Pull Request was created by @smuzaffar (Malik Shahzad Muzaffar) for branch IB/CMSSW_13_3_X/master.

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

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8ef4f2/34975/summary.html
COMMIT: 8e38ec3
CMSSW: CMSSW_13_3_X_2023-09-28-2300/el8_amd64_gcc11
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmsdist/8731/34975/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially removed 2 lines from the logs
• Reco comparison results: 8 differences found in the comparisons
• DQMHistoTests: Total files compared: 50
• DQMHistoTests: Total histograms compared: 3358320
• DQMHistoTests: Total failures: 6
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3358292
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 49 files compared)
• Checked 214 log files, 167 edm output root files, 50 DQM output files
• TriggerResults: no differences found