feat(ntx-builder): serve priority network accounts first

[SantiagoPittella]

Last of four PRs in the stack for #2491.

Summary

Adds --priority-account, which you can repeat. Those accounts get served before anything else when the scheduler fills its slots. Nothing is reserved for the other accounts. Each priority account only ever holds one slot, since an account with a running attempt is skipped anyway, so the only way to starve the rest is to list as many priority accounts as slots. We have an startup warnining in that case.

Includes a lockfile bump of wnaf to 0.14.1 to fix CI.

Changelog

[[entry]]
scope       = "ntx-builder"
impact      = "added"
description = "Added `--priority-account` to serve named network accounts before all others."

[Mirko-von-Leipzig]

That's pretty cool; I thought this would be more difficult.