[clang] [clang] Merge gtest binaries into AllClangUnitTests (PR #134196)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> @rnk see [#137577 (comment)](https://github.com/llvm/llvm-project/pull/137577#issuecomment-2843963228) for some of the bots that got the assertion failure.
> 
> > Update: Back to normal after [afd738c](https://github.com/llvm/llvm-project/commit/afd738cd9016ddef4e26b309770ba35fd017a178).
> 
> I meant the assertion failure also disappeared after that commit.

FWIW, I'm seeing the test failure on Windows x64 with a debug build of Clang's unit tests as of a fresh fetch of `main` this morning.

https://github.com/llvm/llvm-project/pull/134196