worker/api: send job id to worker after all

Full circle. After switching the worker to not operate on jobs directly,
send the id anyway, so that workers can print it in their logs.

cmd/osbuild-worker/main.go

@@ -253,7 +253,7 @@ func main() {
 			log.Fatal(err)
 		}
 
-		fmt.Printf("Running next job\n")
+		fmt.Printf("Running job %v\n", job.Id())
 
 		ctx, cancel := context.WithCancel(context.Background())
 		go WatchJob(ctx, job)
@@ -285,7 +285,7 @@ func main() {
 			// flag to indicate all error kinds.
 			result.Success = false
 		} else {
-			log.Printf("  🎉 Job completed successfully")
+			log.Printf("  🎉 Job completed successfully: %v", job.Id())
 			status = common.IBFinished
 		}