Allow edit tool to access files outside project (with confirmation) (#35221)

Now the edit tool can access files outside the current project (just
like the terminal tool can), but it's behind a prompt (unlike other edit
tool actions).

Release Notes:

- The edit tool can now access files outside the current project, but
only if the user grants it permission to.

crates/assistant_tools/src/grep_tool.rs

@@ -57,7 +57,7 @@ impl Tool for GrepTool {
         "grep".into()
     }
 
-    fn needs_confirmation(&self, _: &serde_json::Value, _: &App) -> bool {
+    fn needs_confirmation(&self, _: &serde_json::Value, _: &Entity<Project>, _: &App) -> bool {
         false
     }