[llvm] [GitHub] Add Copilot review instructions for LLDB (PR #165783)

[Kristof Beyls via llvm-commits]

https://github.com/kbeyls approved this pull request.

Thank you for experimenting with this!
I think it's great to experiment with using LLM tools in ways that help us reduce our limited reviewer bandwidth problem, rather than making it worse!

I left a bunch of nit-picky observations.
But I think this is good to commit as is too, if you think none of those nit-picks make sense.

https://github.com/llvm/llvm-project/pull/165783