feat: call webhooks at least once (#5454)

* feat: call webhooks at least once

* self review

* feat: improve notification observability

* feat: add notification tracing

* test(e2e): test at-least-once webhook delivery

* fix webhook notifications

* dedicated quota notifications handler

* fix linting

* fix e2e test

* wait less in e2e test

* fix: don't ignore failed events in handlers

* fix: don't ignore failed events in handlers

* faster requeues

* question

* fix retries

* fix retries

* retry

* don't instance ids query

* revert handler_projection

* statements can be nil

* cleanup

* make unit tests pass

* add comments

* add comments

* lint

* spool only active instances

* feat(config): handle inactive instances

* customizable HandleInactiveInstances

* call inactive instances quota webhooks

* test: handling with and w/o inactive instances

* omit retrying noop statements

* docs: describe projection options

* enable global handling of inactive instances

* self review

* requeue quota notifications every 5m

* remove caos_errors reference

* fix comment styles

* make handlers package flat

* fix linting

* fix repeating quota notifications

* test with more usage

* debug log channel init failures

internal/notification/handlers/already_handled.go

@@ -0,0 +1,27 @@
+package handlers
+
+import (
+	"context"
+
+	"github.com/zitadel/zitadel/internal/eventstore"
+	"github.com/zitadel/zitadel/internal/repository/user"
+)
+
+func (n *NotificationQueries) IsAlreadyHandled(ctx context.Context, event eventstore.Event, data map[string]interface{}, eventTypes ...eventstore.EventType) (bool, error) {
+	events, err := n.es.Filter(
+		ctx,
+		eventstore.NewSearchQueryBuilder(eventstore.ColumnsEvent).
+			InstanceID(event.Aggregate().InstanceID).
+			AddQuery().
+			AggregateTypes(user.AggregateType).
+			AggregateIDs(event.Aggregate().ID).
+			SequenceGreater(event.Sequence()).
+			EventTypes(eventTypes...).
+			EventData(data).
+			Builder(),
+	)
+	if err != nil {
+		return false, err
+	}
+	return len(events) > 0, nil
+}