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

[Owen Pan via cfe-commits]

owenca wrote:

@rnk see 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.

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