rust-consumer "concurrency" settings is not on par with python consumer

[Fabccc]

Environment

Docker CLI ghcr.io/getsentry/snuba:25.8.0

Steps to Reproduce

docker run -it --entrypoint /bin/bash ghcr.io/getsentry/snuba:25.8.0
# Inside docker container
/usr/local/bin/python3.11 /usr/local/bin/snuba consumer --help
/usr/local/bin/python3.11 /usr/local/bin/snuba rust-consumer --help

Expected Result

Same "processes" alias for the "concurrency" parameter.

Actual Result

classic python consumer shows an alias for "concurrency", "parameters".
Rust-consumer does not display this parameter.

---

I know rust-consumer is an experimental feature, but it's already useful ! thanks for building this.

[linear]

EAP-315