feat(worker): add upload_finisher sweep for pending uploads

[thomasrockhu-codecov]

Summary

• schedule a delayed finisher sweep when coverage uploads remain in UPLOADED
• keep gate key while work is pending and clear it once finishing is complete
• add focused unit tests for sweep scheduling and gate cleanup behavior

Test plan

• ruff check --fix apps/worker/tasks/upload_finisher.py apps/worker/tasks/tests/unit/test_upload_finisher_task.py
• ruff format apps/worker/tasks/upload_finisher.py apps/worker/tasks/tests/unit/test_upload_finisher_task.py
• worker CI

Stacked on #757.

Made with Cursor

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Note

Medium Risk
Adds retry/sweep scheduling and Redis gate lifecycle management to the upload finisher, which changes task orchestration and could affect notification timing or leave commits stuck if misconfigured. Risk is mitigated by explicit max-attempt bounds and expanded unit coverage for terminal/exception paths.

Overview
Adds a delayed finisher “sweep” retry loop when coverage uploads are still in UPLOADED, rescheduling upload_finisher with a bounded sweep_attempt counter and returning structured sweep status instead of silently exiting.

Introduces explicit Redis finisher-gate lifecycle management: sweeps expire the gate to keep it alive while pending work remains, and terminal outcomes now delete the gate on success, idempotent early-exit, max-sweep exhaustion, and exception/timeout paths.

Refactors pending-upload detection into _count_remaining_coverage_uploads and expands unit tests to cover sweep scheduling, max-attempt behavior, and gate cleanup across success and error scenarios.

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