[llvm] [CI] Disable flang from pre-commit tests when Flang files are not touched (PR #93485)

[Mehdi Amini via llvm-commits]

joker-eph wrote:

> > > Isn't is tested in post-commit bots?
> > 
> > 
> > Yes, I just don't see the problem to have it in linux pre-commit since it was reliable so far until now. If it's a problem of build time or load then it's a different issue.
> 
> If there's a way to run on Linux but not Windows, then I don't mind.

OK! Then what about: https://github.com/llvm/llvm-project/pull/93729 ?

https://github.com/llvm/llvm-project/pull/93485