agent: Generate a notification when reaching tool use limit (#31894)

When reaching the consecutive tool call limit, the agent gets blocked
and without a notification, you wouldn't know that. This PR adds the
ability to be notified when that happens, and you can use either sound
_and_ toast, or just one of them.

Release Notes:

- agent: Added support for getting notified (via toast and/or sound)
when reaching the consecutive tool call limit.

crates/eval/src/example.rs

@@ -246,6 +246,7 @@ impl ExampleContext {
                 | ThreadEvent::StreamedAssistantThinking(_, _)
                 | ThreadEvent::UsePendingTools { .. }
                 | ThreadEvent::CompletionCanceled => {}
+                ThreadEvent::ToolUseLimitReached => {}
                 ThreadEvent::ToolFinished {
                     tool_use_id,
                     pending_tool_use,