Add horizontest params to add possibility to run tests for different themes

[ashu-011]

This commit adds two extra paramters for horizontest to modify pytest test command and dynamically set xpath based on upstream and downstream theme

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[lpiwowar]

/lgtm

We're waiting for:

• Add additional parameters for HorizonTest test-operator#276
• Add extra variables to horizontest image tcib#244

[lpiwowar]

Also @ashu-011 you might want to add xpath here ->
https://github.com/openstack-k8s-operators/ci-framework/blob/main/docs/dictionary/en-custom.txt

https://github.com/openstack-k8s-operators/ci-framework/actions/runs/13243015244/job/36962593512?pr=2722

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