fix:script for cleanup stale entries

https://gitlab.e.foundation/e/infra/backlog/-/issues/4617

1) OCC used earlier to generate spam account(if already have this file no need to run this)

docker exec -u www-data dev01_nextcloud bash -lc \ '/var/www/html/occ email-recovery:spam-account-detection \> /tmp/spam-account-report-2025-09-29.txt 2\> &1'

2) Filter it and output it

docker exec -u www-data dev01_nextcloud bash -lc \ '/var/www/html/occ email-recovery:filter-legitimate-domains /tmp/spam-account-report-2025-09-29.txt' > filtered-spam.txt

Test cases:

• Verify that filtered-spam-report.txt contains only spam accounts.
• Verify that all removed accounts are legitimate (i.e., none of the removed accounts are spam).