VCST-4981,VCST-4888-vcst-qa-deployment

[vc-ci]

ci: Automated update vc-frontend from PR 2295 VirtoCommerce/vc-frontend#2295

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Note

Low Risk
Single configuration URL change for theme packaging; no application logic or security-sensitive code is modified.

Overview
Updates the B2B Vue theme deployment artifact to point at a new prerelease build from vc-frontend PR 2295 (2.50.0-pr-2295-7bbe-7bbeb328), replacing the previous 2.49.0-alpha.2342 package URL in theme/artifact.json.

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