Move the secondary build tree into the engine. (#46989) Now, both the DEPS and the custom GN rules for them are in the same repo and won't need a buildroot sibling patch + roll. Part of https://github.com/flutter/flutter/issues/67373. Pending landing of the buildroot patch in https://github.com/flutter/buildroot/pull/781 (the DEPS will be updated before landing and after the presubs pass).
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