[2.4.0] Checkmk Werk 16390 created: notification_rule: cancel previous notifications now working with custom plugin scripts

[//]: # (werk v2) # notification_rule: cancel previous notifications now working with custom plugin scripts key | value ---------- | --- date | 2024-01-31T15:15:29+00:00 version | 2.4.0b1 class | fix edition | cre component | rest-api level | 1 compatible | yes When creating or updating notification rules, the option to "cancel_previous_notifications" was previously not available when the plugin name selected was a custom plugin script. This werk addresses this issue and now allows for custom plugin scripts when setting the option to cancel.