Function setup_flownode_plugins_post_build 

pub async fn setup_flownode_plugins_post_build(
    plugins: &mut Plugins,
    plugin_options: &[PluginOptions],
    builder: &FlownodeBuilder,
) -> Result<()>

Sets up flownode plugins after the FlownodeBuilder is constructed but before FlownodeBuilder::build().

Plugins can read context from the builder (e.g., opts, catalog_manager, flow_metadata_manager) and insert additional plugins. After this call, FlownodeBuilder::set_plugins() should be called to sync plugins into the builder.