Refactor smoketest publish and subscribe helpers to builder pattern

[clockwork-labs-bot]

Description of Changes

Refactors the Rust smoketest helper surface so publish and subscribe variants use builders instead of parallel helper methods.

• Replaces publish_module* helper variants with Smoketest::publish() and fluent options for name, clear, current database, break clients, stdin, replicas, organization, and source modules.
• Replaces subscribe_* / subscribe_background* variants with Smoketest::subscribe(...).expect_rows(...).confirmed(...).background().
• Updates smoketest call sites to the builder APIs.

API and ABI breaking changes

Internal smoketest helper API change only. No product API or ABI changes.

Expected complexity level and risk

2

This touches many smoketest call sites, but the underlying CLI command behavior remains centralized in the same helper internals.

Testing

• Existing CI passes

[bfops]

LGTM if it's passing CI. still some inline questions though.

wrong PR….

[clockwork-labs-bot]

Pushed b83b803ec for the latest review:

• restored publish_module_internal and have PublishBuilder call it
• pass publish options as direct params, without the extra PublishCommand struct
• inlined the one-call source publish dispatcher

I left PublishBuilder / SubscribeBuilder hand-written rather than adding derive_builder: using derive_builder here would either generate a second builder type (PublishBuilderBuilder) or require reintroducing a separate options struct, and these builders have a little stateful behavior (current_database, stdin disabling --yes, source dispatch) that is clearer as explicit methods.