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/model-provider/src/provider.rs

@@ -547,7 +547,6 @@ mod tests {
             "default_verbosity": null,
             "apply_patch_tool_type": null,
             "truncation_policy": {"mode": "bytes", "limit": 10_000},
-            "supports_parallel_tool_calls": false,
             "supports_image_detail_original": false,
             "context_window": 272_000,
             "max_context_window": 272_000,