remove more xfails on "[ONNX] Clean up diagnostic rules"

Summary:

- Remove experimental rules that were never used.
- Fill in detailed rule descriptions.

[ghstack-poisoned]

test/onnx/test_fx_op_consistency.py

@@ -355,10 +355,6 @@
         dtypes=(torch.uint8, torch.int8, torch.int16,),
         reason=onnx_test_common.reason_onnx_script_does_not_support("Add", "int8, int16"),
     ),
-    xfail(
-        "nn.functional.adaptive_avg_pool1d",
-        reason=onnx_test_common.reason_onnx_script_does_not_support("aten::div.Tensor_mode needs type promotion"),
-    ),
     xfail(
         "nn.functional.adaptive_avg_pool2d",
         reason=onnx_test_common.reason_onnx_script_does_not_support("RecursionError: \