Allow closing failed access review campaigns

[gearnode]

Summary

• Enable campaign completion based on the backend pending-entry count.
• Allow campaigns with failed or empty source fetches to complete when no entries remain pending.

Verification

• make relay
• npm -w @probo/console run check

Note: npm ci completed with engine warnings because this workspace has Node 22.14.0 while the repo requests Node 24.

Linear Issue: ENG-538

  

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Summary by cubic

Lets users complete access review campaigns when source fetch failed or returned no entries. Uses the backend pendingEntryCount to decide completion, satisfying ENG-538.

App: console +3 -8

• Query now requests pendingEntryCount and derives canComplete from it.
• Replaces allDecided check and button disable logic to use pending count, enabling completion when pendingEntryCount === 0 even if sources failed or are empty.

^{Written for commit c6d9b34. Summary will update on new commits.}