[2.3.0] Checkmk Werk 14618 created: check_mail_loop: if configured to delete processed mails, check_mail_loop would delete all mails instead

[//]: # (werk v2) # check_mail_loop: if configured to delete processed mails, check_mail_loop would delete all mails instead key | value ---------- | --- date | 2024-01-23T06:59:04+00:00 version | 2.3.0b1 class | fix edition | cre component | checks level | 1 compatible | yes As a result of a refactoring instead of deleting just pre-filtered mails, `check_mail_loop` would delete all previously fetched mails. This change brings back the former behavior.