[ET-VK][Ops] Registering tan tests (#11220)

Registering tan operator for testing

Differential Revision: [D75605351](https://our.internmc.facebook.com/intern/diff/D75605351/)

[ghstack-poisoned]

Author: pytorchbot

backends/vulkan/test/op_tests/cases.py

@@ -1147,6 +1147,7 @@ def get_reduce_op_inputs():
         "aten.hardsigmoid.default",
         "aten.leaky_relu.default",
         "aten.round.default",
+        "aten.tan.default",
     ]
 )
 def get_unary_ops_inputs():