bench: Extract tokio Runtime creation from benchmarking functions #15507
Description
Is your feature request related to a problem or challenge?
Noticed in #15367 (comment), a lot of benchmarks are inadvertently including the time it takes to create a tokio runtime in the benchmark.
Describe the solution you'd like
Extract out the Runtime::new::unwrap() to be outside of benchmarking function.
Describe alternatives you've considered
No response
Additional context
No response