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/config_smtp.go

@@ -0,0 +1,31 @@
+package handlers
+
+import (
+	"context"
+
+	"github.com/zitadel/zitadel/internal/api/authz"
+	"github.com/zitadel/zitadel/internal/crypto"
+	"github.com/zitadel/zitadel/internal/notification/channels/smtp"
+)
+
+// GetSMTPConfig reads the iam SMTP provider config
+func (n *NotificationQueries) GetSMTPConfig(ctx context.Context) (*smtp.Config, error) {
+	config, err := n.SMTPConfigByAggregateID(ctx, authz.GetInstance(ctx).InstanceID())
+	if err != nil {
+		return nil, err
+	}
+	password, err := crypto.DecryptString(config.Password, n.SMTPPasswordCrypto)
+	if err != nil {
+		return nil, err
+	}
+	return &smtp.Config{
+		From:     config.SenderAddress,
+		FromName: config.SenderName,
+		Tls:      config.TLS,
+		SMTP: smtp.SMTP{
+			Host:     config.Host,
+			User:     config.User,
+			Password: password,
+		},
+	}, nil
+}