VCST-5109-vcst-qa-deployment

[vc-ci]

ci: Automated update vc-frontend from PR 2299 VirtoCommerce/vc-frontend#2299

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Note

Low Risk
Low risk change that only updates the theme artifact pointer; risk is limited to pulling a new theme build that could introduce UI regressions.

Overview
Updates theme/artifact.json to point to the vc-theme-b2b-vue 2.50.0 pre-release package (from PR 2299), replacing the previously referenced 2.49.0 artifact.

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