Enable parallel tool calls for all model prompts (#38499)

## What changed

- Set `parallel_tool_calls` for regular and remote compaction prompts without consulting model metadata.
- Remove `supports_parallel_tool_calls` from `ModelInfo`, the bundled model catalog, and related fixtures.
- Preserve the existing Responses Lite behavior that disables parallel tool calls at request construction.

GitOrigin-RevId: 49552bdf97e71fa57325abb49f8adc0c88f1401a

codex-rs/models-manager/src/model_info.rs

@@ -163,7 +163,6 @@ pub fn model_info_from_slug(slug: &str) -> ModelInfo {
         apply_patch_tool_type: None,
         web_search_tool_type: WebSearchToolType::Text,
         truncation_policy: TruncationPolicyConfig::bytes(/*limit*/ 10_000),
-        supports_parallel_tool_calls: false,
         supports_image_detail_original: false,
         context_window: Some(272_000),
         max_context_window: Some(272_000),