Copilot fix o1 model (#30581)

Release Notes:

- Fixed an issue where the `o1` model would not work when using Copilot
Chat

crates/copilot/src/copilot_chat.rs

@@ -237,7 +237,6 @@ pub struct FunctionContent {
 #[serde(tag = "type", rename_all = "snake_case")]
 pub struct ResponseEvent {
     pub choices: Vec<ResponseChoice>,
-    pub created: u64,
     pub id: String,
 }
 

crates/language_models/src/provider/copilot_chat.rs

@@ -264,7 +264,7 @@ impl LanguageModel for CopilotChatLanguageModel {
             }
         }
 
-        let copilot_request = match self.to_copilot_chat_request(request) {
+        let copilot_request = match into_copilot_chat(&self.model, request) {
             Ok(request) => request,
             Err(err) => return futures::future::ready(Err(err)).boxed(),
         };
@@ -423,11 +423,10 @@ pub fn map_to_language_model_completion_events(
     .flat_map(futures::stream::iter)
 }
 
-impl CopilotChatLanguageModel {
-    pub fn to_copilot_chat_request(
-        &self,
+fn into_copilot_chat(
+    model: &copilot::copilot_chat::Model,
     request: LanguageModelRequest,
-    ) -> Result<CopilotChatRequest> {
+) -> Result<CopilotChatRequest> {
     let mut request_messages: Vec<LanguageModelRequestMessage> = Vec::new();
     for message in request.messages {
         if let Some(last_message) = request_messages.last_mut() {
@@ -471,7 +470,7 @@ impl CopilotChatLanguageModel {
                                 });
                             }
                         }
-                            MessageContent::Image(image) if self.model.supports_vision() => {
+                        MessageContent::Image(image) if model.supports_vision() => {
                             content_parts.push(ChatMessageContent::Image {
                                 image_url: ImageUrl {
                                     url: image.to_base64_url(),
@@ -568,9 +567,9 @@ impl CopilotChatLanguageModel {
     Ok(CopilotChatRequest {
         intent: true,
         n: 1,
-            stream: self.model.uses_streaming(),
+        stream: model.uses_streaming(),
         temperature: 0.1,
-            model: self.model.id().to_string(),
+        model: model.id().to_string(),
         messages,
         tools,
         tool_choice: request.tool_choice.map(|choice| match choice {
@@ -579,7 +578,6 @@ impl CopilotChatLanguageModel {
             LanguageModelToolChoice::None => copilot::copilot_chat::ToolChoice::None,
         }),
     })
-    }
 }
 
 struct ConfigurationView {