Add SAMRI icon sync and reduce queue notifications

[stebo85]

Summary

• add SAMRI icon coverage and SVG icon sync support
• reduce apps.json queue notification churn by removing close-event runs and avoiding extra bot comments
• add regression coverage for the notification behavior

Validation

• python -m pytest -q test/test_upload_containers_simg.py test/test_consolidate_appsjson_notifications.py test/test_consolidate_appsjson_canonical.py test/test_consolidate_appsjson_icons.py
• git diff --check