[llvm-branch-commits] [Github]CI] Upload .ninja_log as an artifact (PR #135539)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/135539

This enables using tools like https://github.com/nico/ninjatracing for
performance introspection.