refactor(notification): use new queue package (#9360)

# Which Problems Are Solved

The recently introduced notification queue have potential race conditions.

# How the Problems Are Solved

Current code is refactored to use the queue package, which is safe in
regards of concurrency.

# Additional Changes

- the queue is included in startup
- improved code quality of queue

# Additional Context

- closes https://github.com/zitadel/zitadel/issues/9278

internal/notification/handlers/telemetry_pusher.go

@@ -104,7 +104,7 @@ func (t *telemetryPusher) pushMilestone(ctx context.Context, e *milestone.Reache
 				Type:           e.MilestoneType,
 				ReachedDate:    e.GetReachedDate(),
 			},
-			e,
+			e.EventType,
 		).WithoutTemplate(); err != nil {
 			return err
 		}