scripts: make build faster

[debnil]

Is your feature request related to a problem? Please describe.

Building Nerpa is slow. A large part of this is because we build many Rust crates in scripts/build-nerpa.sh. It will be useful to figure out how we can call cargo build fewer times.

Describe the solution you'd like

Deleting several cargo build calls from scripts/build-nerpa.sh is likely the best approach.

Describe alternatives you've considered

No response

Additional context

No response