hotfix: skip test_exclude_const_metadata (tinygrad#9208)

Author: Qazalin

test/test_tensor.py

@@ -755,6 +755,7 @@ def test_exclude_noop_metadata(self):
     self.assertEqual([m.name for m in k.metadata], ["rand"])
 
   # we exclude const from kernel metadata because tensor methods can share the same CONST UOp
+  @unittest.skip("TODO: flaky")
   def test_exclude_const_metadata(self):
     a = Tensor.arange(4)
     b = Tensor.full((4,), -1, dtype=dtypes.int).contiguous()