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Following the discussion in https://github.com/llvm/llvm-project/pull/93233#issuecomment-2127920882, this patch merges `clang-ci` pipeline into main `GitHub Pull Requests` pipeline. `clang-ci` enables additional test coverage for Clang by compiling it, and then using it to compile and test libc++, libc++abi, and libunwind in C++03, C++26, and Clang Modules modes. Additional work we skip and total time savings we should see: 1. Checking out the repo to generate the clang-ci pipeline (2 minutes) 2. Building Clang (3.5 minutes) 3. Uploading the artifacts once, then downloading them 3 times and unpacking 3 times (0.5 minutes) Note that because previously-split jobs for each mode are now under a single Linux job, it now takes around 8 minutes more see the Linux CI results despite total time savings. The primary goal of this patch is to reduce the load of CI by removing duplicated work. I consider this goal achieved. I could keep the job parallelism we had (3 libc++ jobs depending on a main Linux job), but I don't consider it worth the effort and opportunity cost, because parallelism is not helping once the pool of builders is fully subscribed.