Resolve buck earlier

[jathu]

Summary

Since we resolve buck2 later on, it results in the value of buck2 being empty. It now shows the location:

Test plan

$ cmake --preset pybind && cmake --build cmake-out -j $(sysctl -n hw.ncpu)

-- --- Configured Options ---

-- CMAKE_CXX_STANDARD                      : 17
-- CMAKE_SYSTEM_PROCESSOR                  : arm64
-- CMAKE_BUILD_TYPE                        : Debug
-- PYTHON_EXECUTABLE                       : /Users/jathu/executorch/.venv/bin/python3
-- BUCK2                                   : /Users/jathu/executorch/buck2-bin/buck2-2025-05-06-201beb86106fecdc84e30260b0f1abb5bf576988

cc @larryliu0820

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11451

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