Optimize initialization of networking protocol benchmarks

[AndreiEres]

Description

These changes should enhance the quality of benchmark results by excluding worker initialization time from the measurements and reducing the overall duration of the benchmarks.

Integration

It should not affect any downstream projects.

Review Notes

• Workers initialize once per benchmark to avoid side effects.
• The listen address is assigned when a worker starts.
• Benchmarks are divided into two groups by size to create better charts for comparison.

[AndreiEres]

/cmd prdoc --audience node_dev

[paritytech-workflow-stopper]

All GitHub workflows were cancelled due to failure one of the required jobs.
Failed workflow url: https://github.com/paritytech/polkadot-sdk/actions/runs/12010630549
Failed job name: cargo-clippy