[llvm] Avoid exposing password and token from git repositories (PR #105220)

[Tulio Magno Quites Machado Filho via llvm-commits]

tuliom wrote:

As mentioned in the [Forum](https://discourse.llvm.org/t/rfc-avoid-exposing-unknown-git-repositories/80962/16), the discussion on this has been going down.
I believe the current change doesn't change the behavior as the original one did.
So, I plan to merge it later today if nobody objects.

https://github.com/llvm/llvm-project/pull/105220