Support Rust-movable, C++ non-movable types in StatusOr via UnsafeRelocateTag. - #1934
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…ocateTag. - Define UnsafeRelocateTag in a shared header support/unsafe_relocate_tag.h. - Make proto::Rust<T> (proto2::Rust<T>) non-movable in C++ to preserve its non-null invariant, and add an UnsafeRelocateTag constructor for destructive relocation. - Add an UnsafeRelocateTag constructor to absl::StatusOr<T> when T supports UnsafeRelocateTag. - Test that Vec<MessageType> and NewStatusOr<MessageType> bind cleanly as rs_std::Vec<proto::Rust<MessageType>> and absl::StatusOr<proto::Rust<MessageType>> in C++. PiperOrigin-RevId: 974770314
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Support Rust-movable, C++ non-movable types in StatusOr via UnsafeRelocateTag.