feat: make interrupt state not final for multi-agents (#13850)

Make `interrupted` an agent state and make it not final. As a result, a
`wait` won't return on an interrupted agent and no notification will be
send to the parent agent.

The rationals are:
* If a user interrupt a sub-agent for any reason, you don't want the
parent agent to instantaneously ask the sub-agent to restart
* If a parent agent interrupt a sub-agent, no need to add a noisy
notification in the parent agen

codex-rs/exec/src/event_processor_with_jsonl_output.rs

@@ -815,6 +815,10 @@ impl From<CoreAgentStatus> for CollabAgentState {
                 status: CollabAgentStatus::Running,
                 message: None,
             },
+            CoreAgentStatus::Interrupted => Self {
+                status: CollabAgentStatus::Interrupted,
+                message: None,
+            },
             CoreAgentStatus::Completed(message) => Self {
                 status: CollabAgentStatus::Completed,
                 message,