Revert "Move googletest to the third-party directory"

This reverts commit 59052468c3e38cab15582cefbb5133fd4c2ffce5.

It looks like this patch breaks the build when compiler-rt is passed to
LLVM_ENABLE_PROJECTS instead of LLVM_ENABLE_RUNTIMES.

GitOrigin-RevId: 8a084f68c8a1cac99d9fa0fbcf490b53ab3b6e0c
1 file changed