VCST-4867-vcst-qa-deployment

[vc-ci]

ci: Automated update vc-frontend from PR 2241 VirtoCommerce/vc-frontend#2241

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Note

Low Risk
Low risk: updates only the theme artifact download URL, with no code logic changes. Main risk is pulling an incorrect or unavailable build artifact.

Overview
Updates theme/artifact.json to point to the newer prerelease vc-theme-b2b-vue artifact (PR 2241 build) by replacing the existing package URL.

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