release: To Prod (drop DB integration block migration)

[OleksandrUA]

Summary

Release staging -> prod. Contains the follow-up to the 2026-05-21 incident:

Drop global Database Query plugin block (#1339, migration 0083)

• Drops the block_database_integration_type trigger on integrations (installed by migration 0082 to disable DB Query plugin globally during the active incident).
• Idempotent via DROP TRIGGER IF EXISTS / DROP FUNCTION IF EXISTS.
• Already removed on the prod DB via direct DDL during incident response; this PR brings the migration source-of-truth in line with prod state.

Other defences from the incident remain in place:

• block_executions trigger on workflow_executions
• block_user_signup trigger on users
• SSRF guard parity across HTTP and database plugin SQL paths
• NetworkPolicy on workflow-runner pods (IMDS + link-local + ULA blocked)
• IMDSv2 hop-limit=1 on Karpenter NodeClasses

Test plan

• CI green on PR hotfix(security): drop global Database Query plugin block #1339 before staging merge
• Staging deploy succeeded (run 26241318512)
• CI green on this PR before prod merge
• After prod merge: pnpm db:migrate advances journal cleanly; trigger remains absent (already dropped)
• Confirm Sky engineers can re-create DB integrations after this lands