install_executorch.sh --clean should remove buck-out/ #11564
Description
🚀 The feature, motivation and pitch
We remove cmake-out/ pip-out/ when we run install_executorch.sh --clean, we should also remove buck-out/ as some of the file changes will not update in buck-out/ automatically if we pull the latest, and that causes issues.
For example, #10675 introduces a new file platform/platforms.cpp and since buck-out/ caches the value of buck uquery "inputs(deps(//runtime/platform:platform))", it doesn't generate executorch_srcs.cmake file correctly, with the new file platform/platforms.cpp.
This kind of issue is hard to debug, so we should remove buck-out/ every time user run install_executorch.sh --clean.
Alternatives
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Additional context
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RFC (Optional)
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