[WIP]Skip downstream dispatch for modular issues after triage

[fila43]

Summary

• Modular issues (detected by "/" in downstream_component from customfield_10669) stop after triage — no rebase, backport, rebuild, clarification, open-ended-analysis, or reproducer jobs are enqueued.
• Non-modular issues are completely unaffected and follow the existing AUTO_CHAIN / TRIAGE_ENQUEUE_REPRODUCER behavior.
• The full triage workflow (LLM analysis, CVE applicability, branch mapping, Jira comment, labels) still runs for modular issues — only downstream queue dispatch is gated.
• This lets us validate triage results for modular packages in production before enabling the full pipeline.

Test plan

• Deploy to staging — verify modular issues are triaged and commented but not dispatched downstream
• Verify non-modular issues still flow through rebase/backport/rebuild as before
• Check logs for "Modular issue RHEL-XXXXX — stopping after triage" messages

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