[llvm] [Debugify] Add 'error-test' mode for the debugify report script, for CI (PR #147574)

[Stephen Tozer via llvm-commits]

SLTozer wrote:

I suspect if anyone is well-equipped to review this it would be @djtodoro - otherwise, I think this is a relatively "low-stakes" change.

https://github.com/llvm/llvm-project/pull/147574