language_models: Fix tool calling for x-ai/grok-code-fast-1 model via OpenRouter (#37094)

Closes #37022
Closes #36994

This update ensures all Grok models use the JsonSchemaSubset format for
tool schemas.

A previous fix for this issue was too specific, only targeting grok-4
models. This caused other variants, like grok-code-fast-1, to be missed.
We've now broadened the logic to correctly apply the setting to the
entire Grok model family.

Release Notes:

- Fix tool calling for `x-ai/grok-code-fast-1` model via OpenRouter.

Author: imumesh18

crates/language_models/src/provider/open_router.rs

@@ -381,7 +381,7 @@ impl LanguageModel for OpenRouterLanguageModel {
 
     fn tool_input_format(&self) -> LanguageModelToolSchemaFormat {
         let model_id = self.model.id().trim().to_lowercase();
-        if model_id.contains("gemini") || model_id.contains("grok-4") {
+        if model_id.contains("gemini") || model_id.contains("grok") {
             LanguageModelToolSchemaFormat::JsonSchemaSubset
         } else {
             LanguageModelToolSchemaFormat::JsonSchema