BOLT-1926 (RH-16b): additive externalSnapshot migration on WorkspaceProgramIntegration

completed

Priority: 1

Branch: winston/bolt-1926-integration-external-snapshot

PR: #14613

Linear: BOLT-1926

Ship-the-migration-first PR. Adds externalSnapshot Json? + externalSnapshotAt DateTime? nullable columns to WorkspaceProgramIntegration in domains/program. Purely additive, no index/backfill/GraphQL. Branch winston/bolt-1926-integration-external-snapshot.

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