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/channels/instrumenting/tracing.go

@@ -0,0 +1,16 @@
+package instrumenting
+
+import (
+	"context"
+
+	"github.com/zitadel/zitadel/internal/notification/channels"
+	"github.com/zitadel/zitadel/internal/telemetry/tracing"
+)
+
+func traceMessages(ctx context.Context, channel channels.NotificationChannel, spanName string) channels.NotificationChannel {
+	return channels.HandleMessageFunc(func(message channels.Message) (err error) {
+		_, span := tracing.NewNamedSpan(ctx, spanName)
+		defer func() { span.EndWithError(err) }()
+		return channel.HandleMessage(message)
+	})
+}