New ONNX, TorchScript, CoreML export test matrices (#11652)

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

ultralytics/engine/exporter.py

@@ -599,6 +599,7 @@ class Exporter:
 
         LOGGER.info(f"\n{prefix} starting export with coremltools {ct.__version__}...")
         assert not WINDOWS, "CoreML export is not supported on Windows, please run on macOS or Linux."
+        assert self.args.batch == 1, "CoreML batch sizes > 1 are not supported. Please retry at 'batch=1'."
         f = self.file.with_suffix(".mlmodel" if mlmodel else ".mlpackage")
         if f.is_dir():
             shutil.rmtree(f)