[CIR] TryOp add arg default value and update diagnostic (#163856)

- Add a default value to handler_types to be able to construct TryOp,
then modify the handlers.
- Move empty region diagnostic from tablegen constraints to C++, because
we need the ability to add an empty region, then modify it later, for
example, in the handlers builder, but we need to report an error when we
find it in the IR while parsing.

Issue https://github.com/llvm/llvm-project/issues/154992

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