[release] consolidate release and release-snapshot into one workflow for Trusted Publishing

[elliotdauber]

Trusted Publishing only allows one workflow. Moves release-snapshot into release, controlled by a flag

[vercel]

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Project	Deployment	Actions	Updated (UTC)
vercel-storage-next-integration-test-suite	Ready	Preview	Apr 28, 2026 9:00pm

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Latest commit: 0e21e8b

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[falcoagustin]

LGTM. Consolidation logic is correct — inputs.snapshot gating works for both push (null → normal release) and workflow_dispatch paths. Updated header comment also fixes the stale version-format example from the old file.