Pull action_log into its own crate (#35959)

Release Notes:

- N/A

crates/assistant_tools/src/find_path_tool.rs

@@ -1,7 +1,8 @@
 use crate::{schema::json_schema_for, ui::ToolCallCardHeader};
+use action_log::ActionLog;
 use anyhow::{Result, anyhow};
 use assistant_tool::{
-    ActionLog, Tool, ToolCard, ToolResult, ToolResultContent, ToolResultOutput, ToolUseStatus,
+    Tool, ToolCard, ToolResult, ToolResultContent, ToolResultOutput, ToolUseStatus,
 };
 use editor::Editor;
 use futures::channel::oneshot::{self, Receiver};