[llvm] [CI] include utils in monolithic scripts (PR #158090)

[Nikita Popov via llvm-commits]

nikic wrote:

The thing is that this PR just doesn't make any sense in isolation. It it needed *if and only if* the other PR lands. If the other PR does not get approved, then this PR just leaves us with a bunch of unnecessary and confusing options in the CI config.

I don't think there is much point in splitting out this change, this can just be folded into the other PR and reviewed as part of it.

https://github.com/llvm/llvm-project/pull/158090