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

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 commented:

> This PR adds *_UTILS to the monolithic scripts so that follow-up PRs can use utils in install flow tests.

More information on what exactly this is intended to test would be good. 

It also looks like this is on by default? https://github.com/llvm/llvm-project/blob/89e32acde5a8a0059219ca319ee6bb2114104b49/llvm/CMakeLists.txt#L849

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