[scheduled tasks] Improve scheduled task logging
With "System Log" available scheduled tasks now can log more info about what they are doing:
| Scheduled Task Name | What Can Be Written | Log Level |
|---|---|---|
| check_submission_repies | how much replies where processed in each run | Info |
| check_bounced_submission_repies | how much bounced replies where processed in each run | Info |
| clean_catalog_images | how much images were deleted and total freed disk amount | Info |
| clean_resized_catalog_images | how much images were deleted and total freed disk amount | Info |
| rotate_email_logs | how much logged e-mails were deleted | Debug |
| generate_mailing_queue | how much e-mails were queued (from mailing list processing) | Debug |
| membership_expiration | how much user memberships were expired (user count for each group) | Info |
| delete_expired_sessions | how much expired sessions were deleted (vs sessions still active) | Debug |
| process_email_queue | how much e-mails were sent out from a queue | Info |
No info should be written in case, when no data was processed by a scheduled task.
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