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
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