ci: skip feedback artifacts after preflight failure

[haasonsaas]

Summary

• add step ids to the feedback sentinel/backfill sweep steps
• skip artifact uploads when the org-token preflight prevents the sweep from running
• keep missing-token failures focused on the actionable preflight error instead of follow-on missing artifact noise

Verification

• actionlint .github/workflows/review-feedback-backfill.yml .github/workflows/review-feedback-sentinel.yml
• YAML parse check for both workflows

[cursor]

PR Summary

Low Risk
Low risk CI-only change that adjusts workflow step conditions to avoid failing artifact uploads when the sweep/backfill step never ran (e.g., missing org token).

Overview
Prevents the review-feedback-sentinel and review-feedback-backfill workflows from uploading ledger/backlog artifacts when the sweep/backfill step is skipped.

This adds step ids to the sweep/backfill steps and gates the upload-artifact steps with steps.<id>.outcome != 'skipped', reducing noisy follow-on failures after the missing-token preflight error.

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