Accept wrapped text content from LLM providers (#31048)

Some providers sometimes send `{ "type": "text", "text": ... }` instead
of just the text as a string. Now we accept those instead of erroring.

Release Notes:

- N/A

crates/language_models/src/provider/copilot_chat.rs

@@ -23,7 +23,7 @@ use language_model::{
     LanguageModelProviderName, LanguageModelProviderState, LanguageModelRequest,
     LanguageModelRequestMessage, LanguageModelToolChoice, LanguageModelToolResultContent,
     LanguageModelToolSchemaFormat, LanguageModelToolUse, MessageContent, RateLimiter, Role,
-    StopReason,
+    StopReason, WrappedTextContent,
 };
 use settings::SettingsStore;
 use std::time::Duration;
@@ -455,7 +455,11 @@ fn into_copilot_chat(
                 for content in &message.content {
                     if let MessageContent::ToolResult(tool_result) = content {
                         let content = match &tool_result.content {
-                            LanguageModelToolResultContent::Text(text) => text.to_string().into(),
+                            LanguageModelToolResultContent::Text(text)
+                            | LanguageModelToolResultContent::WrappedText(WrappedTextContent {
+                                text,
+                                ..
+                            }) => text.to_string().into(),
                             LanguageModelToolResultContent::Image(image) => {
                                 if model.supports_vision() {
                                     ChatMessageContent::Multipart(vec![ChatMessagePart::Image {