Reduce the surface of collaboration modes (#20149)

Collaboration modes were slightly invasive both into ThreadManager
construction and ModelProvider

codex-rs/core/tests/suite/client.rs

@@ -14,7 +14,6 @@ use codex_model_provider_info::ModelProviderInfo;
 use codex_model_provider_info::WireApi;
 use codex_model_provider_info::built_in_model_providers;
 use codex_models_manager::bundled_models_response;
-use codex_models_manager::collaboration_mode_presets::CollaborationModesConfig;
 use codex_otel::SessionTelemetry;
 use codex_otel::TelemetryAuthMode;
 use codex_protocol::ThreadId;
@@ -1106,11 +1105,6 @@ async fn prefers_apikey_when_config_prefers_apikey_even_with_chatgpt_tokens() {
         &config,
         auth_manager,
         SessionSource::Exec,
-        CollaborationModesConfig {
-            default_mode_request_user_input: config
-                .features
-                .enabled(Feature::DefaultModeRequestUserInput),
-        },
         Arc::new(codex_exec_server::EnvironmentManager::default_for_tests()),
         /*analytics_events_client*/ None,
     );