fix: adapt konflux-demo for konflux-ci

[psturc]

Description

• update konflux-demo test to be compatible with both downstream (infra-deployments) and upstream (konflux-ci/konflux-ci) versions of konflux

Issue ticket number and link

KONFLUX-3683

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Tested the code changes also in konflux-ci repo in this check run

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added meaningful description with JIRA/GitHub issue key(if applicable), for example HASSuiteDescribe("STONE-123456789 devfile source")
• I have updated labels (if needed)

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[psturc]

/retest

[psturc]

/retest

[ascerra]

Do we need to update the README here describing this new case for konflux demo-test
https://github.com/konflux-ci/e2e-tests/blob/9a6c4554c393b526a24c3b137a59faae436afc61/tests/konflux-demo/README.md?plain=1

Maybe here to show the run command for the upstream case?
https://github.com/konflux-ci/e2e-tests/blame/9a6c4554c393b526a24c3b137a59faae436afc61/tests/konflux-demo/README.md#L43

[ascerra]

/lgtm

[openshift-ci]

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In response to this:

/lgtm

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[ascerra]

/lgtm

[psturc]

/approve

[ascerra]

/approve

[openshift-ci]

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This pull-request has been approved by: ascerra, psturc

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