kobotoolbox / kpi / 19931924257

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feat(exports): remove audit log exports older than `EXPORT_CLEANUP_GRACE_PERIOD` DEV-1369 (#6520)

### 📣 Summary
Automatically removes old audit log exports to prevent outdated files
from being accessible and to keep storage usage under control.

### 📖 Description
Audit log exports are now cleaned up automatically after they expire.
New recurring background tasks `cleanup_access_log_exports` and
`cleanup_project_history_log_exports` deletes export files and their
corresponding records once they are older than the value defined in
`EXPORT_CLEANUP_GRACE_PERIOD` (configured in Constance, default: 30
minutes).

To ensure system stability, the cleanup runs in small batches of 200
exports per execution and uses a distributed lock to prevent multiple
workers from deleting the same exports simultaneously. This keeps
storage usage under control and prevents outdated export files from
remaining accessible.

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