[DO NOT MERGE] MSFT Build Copilot coding agent megabranch (#55536)

Co-authored-by: hubwriter <[email protected]>
Co-authored-by: Felicity Chapman <[email protected]>
Co-authored-by: Joe Clark <[email protected]>
Co-authored-by: Isaac Brown <[email protected]>
Co-authored-by: Anne-Marie <[email protected]>
Co-authored-by: felix <[email protected]>
Co-authored-by: Felix Guntrip <[email protected]>
Co-authored-by: Copilot <[email protected]>
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Co-authored-by: Tim Rogers <[email protected]>
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Author: 23 people