fix(apply_patch) tests for shell_command (#7307)

## Summary
Adds test coverage for invocations of apply_patch via shell_command with
heredoc, to validate behavior.

## Testing
- [x] These are tests

codex-rs/core/tests/common/responses.rs

@@ -431,6 +431,9 @@ pub fn ev_apply_patch_call(
         ApplyPatchModelOutput::ShellViaHeredoc => {
             ev_apply_patch_shell_call_via_heredoc(call_id, patch)
         }
+        ApplyPatchModelOutput::ShellCommandViaHeredoc => {
+            ev_apply_patch_shell_command_call_via_heredoc(call_id, patch)
+        }
     }
 }
 
@@ -492,6 +495,13 @@ pub fn ev_apply_patch_shell_call_via_heredoc(call_id: &str, patch: &str) -> Valu
     ev_function_call(call_id, "shell", &arguments)
 }
 
+pub fn ev_apply_patch_shell_command_call_via_heredoc(call_id: &str, patch: &str) -> Value {
+    let args = serde_json::json!({ "command": format!("apply_patch <<'EOF'\n{patch}\nEOF\n") });
+    let arguments = serde_json::to_string(&args).expect("serialize apply_patch arguments");
+
+    ev_function_call(call_id, "shell_command", &arguments)
+}
+
 pub fn sse_failed(id: &str, code: &str, message: &str) -> String {
     sse(vec![serde_json::json!({
         "type": "response.failed",