Remove `Rust::make_unique` #8371

Job	Run time
build-and-check-asan	10m 55s
build-and-check-clang-macos	19m 34s
build-and-check-gcc-5	12m 15s
build-and-check-ubuntu-32bit	11m 2s
build-and-check-ubuntu-64bit	10m 36s
build-and-check-ubuntu-64bit-glibcxx	6m 17s
	1h 10m 39s

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