convert all programs to rust programs calling mains from cpp lib #47771
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Notably this changes the build order. Previously, the Rust code was built first (lib and programs) followed by all the C++ code which could use the Rust lib as needed. With this change, the C++ lib is built first, followed by the Rust code which uses the C++ lib as needed, followed by the C++ tests which use both the C++ lib and Rust lib as needed.