bin/ci_run_n_monitor: explain that the 'Universal Recycling symbol' ♲ emoji means these jobs were cancelled

And not "restarted" for instance, which would also be a reasonable
interpretation.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30223>

bin/ci/ci_run_n_monitor.py

@@ -286,6 +286,7 @@ def cancel_jobs(
     if not to_cancel:
         return
 
+    print("Cancelled jobs: ", end=" ")
     with ThreadPoolExecutor(max_workers=6) as exe:
         part = partial(cancel_job, project)
         exe.map(part, to_cancel)