fix(jseval): increase QuickJS memory limit from 32MB to 256MB

[salarkhannn]

Flow expression evaluation uses QuickJS to evaluate step input transforms. The 32MB memory limit was too restrictive for payloads that construct large arrays — for example Array.from({length: 1e6}, ...).flat() exceeds 32MB and causes QuickJS to throw Exception generated by quickjs, surfacing as an opaque eval failure.

Increasing the limit to 256MB. QuickJS evaluations are always authenticated and run inside the worker per-job isolation, so this is safe.

Closes #8073.

---

Summary by cubic

Increase the QuickJS memory limit for flow expression evaluation from 32MB to 256MB to prevent opaque eval failures on large payloads (e.g., million-element arrays). Evaluations are authenticated and run in per‑job isolated workers, so this increase is safe.

^{Written for commit 5c5b6b9. Summary will update on new commits.}

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[salarkhannn]

I have read the CLA Document and I hereby sign the CLA

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}