Treat invalid JSON in tool calls as failed tool calls (#29375)

Release Notes:

- N/A

---------

Co-authored-by: Max <max@zed.dev>
Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/eval/src/example.rs

@@ -253,6 +253,9 @@ impl ExampleContext {
                         }
                     });
                 }
+                ThreadEvent::InvalidToolInput { .. } => {
+                    println!("{log_prefix} invalid tool input");
+                }
                 ThreadEvent::ToolConfirmationNeeded => {
                     panic!(
                         "{}Bug: Tool confirmation should not be required in eval",