test: use the transaction's json helper in the malformed cleanup fixture

[lawrencecchen]

web-typecheck fails on main since #15423: web/tests/vm-workflows.test.ts(6219,37): error TS18047: 'sql' is possibly 'null'. The call sits inside sql.begin(async (tx) => …), where TypeScript drops the earlier null narrowing of the module-level sql. The inserts already go through tx, so the fixture now encodes the JSON with tx.json too.

bunx tsc --noEmit -p web reports 0 errors.

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Summary by cubic

Fixes a web typecheck failure by switching the malformed cleanup fixture to use tx.json instead of sql.json inside sql.begin, where TypeScript no longer narrows the module-level sql.

^{Written for commit 762349b. Summary will update on new commits.}

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• web/tests/vm-workflows.test.ts

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[github-actions]

Merge receipt for 762349b4aa, merged 2026-09-30 19:58:56 UTC

• Not verified at merge: ci-status (not reported), CI fast guards (in progress), Fast static checks (in progress), guest-install (in progress), Testbox broker trust boundary (in progress), Web complexity (in progress), Web complexity candidate (in progress)
• Verified: web-validation
• Skipped by policy: web-build, web-database-tests, web-tests
• Full suite: runs on main after merge.

Labeled merged-unverified: if main breaks near this merge, look here first.