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

[Maksim Levental via llvm-commits]

makslevental wrote:

> So this will break everyone who sets `LLVM_ENABLE_EXAMPLES=ON` but not `LLVM_INSTALL_UTILS=ON`? That kind of seems like a problem.

What is `this`? This PR doesn't break anything/anyone because it's NFC because as nikita currently mentioned, monolithic doesn't actually install anything.

That test in the follow-up PR won't break anyone beside it will only run in CI here (it's discussed in the PR description).

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