Reuse conversation cache when streaming edits (#30245)

Release Notes:

- Improved latency when the agent applies edits.

crates/assistant_tools/src/open_tool.rs

@@ -2,7 +2,7 @@ use crate::schema::json_schema_for;
 use anyhow::{Context as _, Result, anyhow};
 use assistant_tool::{ActionLog, Tool, ToolResult};
 use gpui::{AnyWindowHandle, App, AppContext, Entity, Task};
-use language_model::{LanguageModel, LanguageModelRequestMessage, LanguageModelToolSchemaFormat};
+use language_model::{LanguageModel, LanguageModelRequest, LanguageModelToolSchemaFormat};
 use project::Project;
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
@@ -49,7 +49,7 @@ impl Tool for OpenTool {
     fn run(
         self: Arc<Self>,
         input: serde_json::Value,
-        _messages: &[LanguageModelRequestMessage],
+        _request: Arc<LanguageModelRequest>,
         project: Entity<Project>,
         _action_log: Entity<ActionLog>,
         _model: Arc<dyn LanguageModel>,