Pull action_log into its own crate (#35959)

Release Notes:

- N/A

crates/agent2/src/tools/edit_file_tool.rs

@@ -1,7 +1,7 @@
 use crate::{AgentTool, Thread, ToolCallEventStream};
 use acp_thread::Diff;
 use agent_client_protocol as acp;
-use anyhow::{anyhow, Context as _, Result};
+use anyhow::{Context as _, Result, anyhow};
 use assistant_tools::edit_agent::{EditAgent, EditAgentOutput, EditAgentOutputEvent, EditFormat};
 use cloud_llm_client::CompletionIntent;
 use collections::HashSet;
@@ -457,7 +457,7 @@ mod tests {
     use crate::Templates;
 
     use super::*;
-    use assistant_tool::ActionLog;
+    use action_log::ActionLog;
     use client::TelemetrySettings;
     use fs::Fs;
     use gpui::{TestAppContext, UpdateGlobal};