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CI: build benchmarks binaries once for all targets #6708

Job	Run time
Rust publish dry-run	32s
check-java-publish-build (aarch64-unknown-linux-gnu, runs-on=30643002551/runner=arm64-medium/imag...	1m 8s
check-java-publish-build (x86_64-unknown-linux-gnu, runs-on=30643002551/runner=amd64-medium/image...	54s
Python (wheel build)	6m 32s
Compat check / compat-test	30s
	9m 36s