[llvm] workflows/pr-subscriber: Handle libc++ and libc++abi labels (PR #66029)

[Tom Stellard via llvm-commits]

tstellar wrote:

> LGTM. Would you prefer instead that we rename the labels to libcxx and libcxxabI?

That's the other option, but people on Discord expressed a preference to keep the current label names.

https://github.com/llvm/llvm-project/pull/66029