Add backend logic for event action filters for chat_notification

Jan Stancekrequested to merge
gitlab-community/gitlab-org/gitlab:jstancek/subactions_for_notification_integrations_v2 into master

Add backend logic for event action filters for chat_notification

This builds on previously introduced field event_filters for integrations, and allows to filter incoming events based on their 'action'.

Relates to &5238 Related to &21117 Closes #591595

Signed-off-by: Jan Stancek jstancek@redhat.com

Edited by Jan Stancek

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