move-only: Move AbortNode to shutdown

Can be reviewed with the git option
--color-moved=dimmed-zebra

src/shutdown.h

@@ -6,6 +6,11 @@
 #ifndef BITCOIN_SHUTDOWN_H
 #define BITCOIN_SHUTDOWN_H
 
+#include <util/translation.h> // For bilingual_str
+
+/** Abort with a message */
+bool AbortNode(const std::string& strMessage, bilingual_str user_message = bilingual_str{});
+
 /** Initialize shutdown state. This must be called before using either StartShutdown(),
  * AbortShutdown() or WaitForShutdown(). Calling ShutdownRequested() is always safe.
  */