[clang] [clang-format] Extract utility functions outside of test fixture (PR #78108)

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mydeveloperday wrote:

> > I don't understand why we need to refactor this?
> 
> During the review for #77918 there was an ask to extract the refactor in a separate PR.
> 
> In #77918, I'm adding a couple new test fixtures and plan to use these utility functions for verifying assumptions.

Am I missing someone but how do you plan on using these functions if they are in an anonymous namespace in the file and not part of a class where they are static? maybe I missed something.

https://github.com/llvm/llvm-project/pull/78108