[composite compliance] quantile and nanquantile (#81767)

Reference: #69991

This adds a new CompositeExplicit Operator `at::assert_all_true` (also exposed in Python) to check the truthiness of a tensor and throw an error based on that.

This helps us mitigate `TORCH_CHECK(t.all().item<bool>(), "err_msg")` pattern which is not composite compliant.

Using the mentioned operator, we fix `quantile` and `nanquantile` to be Composite Compliant.

Question: Should it be documented?
Pull Request resolved: https://github.com/pytorch/pytorch/pull/81767
Approved by: https://github.com/zou3519
diff --git a/test/test_proxy_tensor.py b/test/test_proxy_tensor.py
index 1f3975a..493d481 100644
--- a/test/test_proxy_tensor.py
+++ b/test/test_proxy_tensor.py
@@ -603,9 +603,7 @@
     # data-dependent control flow
     xfail('cov'),
     xfail('istft'),
-    xfail('nanquantile'),
     xfail('nn.functional.gaussian_nll_loss'),
-    xfail('quantile'),
     xfail('tensor_split'),
     xfail('corrcoef'),
 
@@ -824,6 +822,7 @@
     xfail('msort', ''),  # aten.sort.default - couldn't find symbolic meta function/decomposition
     xfail('mv', ''),  # aten.mv.default - couldn't find symbolic meta function/decomposition
     xfail('nanmean', ''),  # The underlying op of 'aten.stride' has no overload name '_schema'
+    xfail('nanquantile', ''),  # Could not run 'aten::equal' with arguments from the 'Meta' backend.
     xfail('narrow', ''),  # aten.size.default - couldn't find symbolic meta function/decomposition
     xfail('native_layer_norm', ''),  # Unexpected type <class 'torch.SymIntNode'> when computing elementwise type promot...
     xfail('nn.functional.adaptive_avg_pool1d', ''),  # aten.size.default - couldn't find symbolic meta function/decomposition
@@ -917,6 +916,7 @@
     xfail('polygamma', 'polygamma_n_3'),  # aten.polygamma.default - couldn't find symbolic meta function/decomposition
     xfail('polygamma', 'polygamma_n_4'),  # aten.polygamma.default - couldn't find symbolic meta function/decomposition
     xfail('put', ''),  # aten.clone.default - couldn't find symbolic meta function/decomposition
+    xfail('quantile', ''),  # Could not run 'aten::equal' with arguments from the 'Meta' backend.
     xfail('qr', ''),  # aten.linalg_qr.default - couldn't find symbolic meta function/decomposition
     xfail('rad2deg', ''),  # aten.rad2deg.default - couldn't find symbolic meta function/decomposition
     xfail('rand_like', ''),  # aten.randn_like.default - couldn't find symbolic meta function/decomposition