fix rb_obj_copy_ivar to not copy object_id over #7318

Job	Run time
cargo clippy	31s
cargo test	52s
make (yjit-bindgen, To fix: use patch in logs, --with-gcc=clang-14 --enable-yjit=dev, /usr/lib/ll...	4m 41s
make (check, RUSTC='rustc +1.58.0', 1.58.0)	5m 59s
make (check, --enable-yjit=dev)	5m 31s
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc, -T --yj...	10m 9s
make (test-bundled-gems, --enable-yjit=dev)	17m 58s
make (yjit-bench, --enable-yjit=dev, --yjit-stats, true)	5m 44s
YJIT Ubuntu result	1s
	51m 26s

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