The Complement integration-test job prints the full raw `go test -json`
stream straight to the GitHub Actions build log. That's an enormous,
unreadable wall of JSON, and the GitHub web UI renders very large logs
poorly — making the run hard to view and slow to load.
Instead, let's store the raw JSON and upload it as an artefact. We still
render failing test output as before.
We will still stream when tests finish (i.e. PASS / FAIL) so that people
can see that things are actually running. However, all other output
(such as logs) are hidden.
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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
