Update on "[etrecord] Implement generic fallback for GraphModuleSerializer.handle_call_function"

Title says it all!

Implement the case where `node.target` is neither `torch._ops.OpOverload` or `torch._ops.HigherOrderOperator`, instead of throwing an exception.

Differential Revision: [D88216198](https://our.internmc.facebook.com/intern/diff/D88216198/)

[ghstack-poisoned]

Author: ssjia