feat(KONFLUX-4272): Update latest PaC config in run-stage-max-concurrency.sh

[rh-rahulshetty]

Description

Follow up change based on #1382

Remove non-PAC build configs from run-stage-max-concurrency.sh script and use the latest templating env variable.

Issue ticket number and link

KONFLUX-4272

Type of change

Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Locally tested the changes against stage cluster.

source user.env
export THRESHOLD=3500 MAX_THREADS=300 MAX_CONCURRENCY_STEPS=2 COMPONENT_REPO=https://github.com/rh-perf-test-org/devfile-sample RUN_ON_STAGE=true
./tests/load-tests/ci-scripts/max-concurrency/load-test.sh
./tests/load-tests/ci-scripts/max-concurrency/collect-results.sh

Checklist:

I have performed a self-review of my code.

[jhutar]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jhutar

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[jhutar]

Thank you Rahul!