Add "End Repeat Loops" menu item

Marlin/src/feature/repeat.h

   static uint8_t index;
 public:
   static inline void reset() { index = 0; }
+  static inline bool is_active() {
+    LOOP_L_N(i, index) if (marker[i].counter) return true;
+    return false;
+  }
   static bool is_command_M808(char * const cmd) { return cmd[0] == 'M' && cmd[1] == '8' && cmd[2] == '0' && cmd[3] == '8' && !NUMERIC(cmd[4]); }
   static void early_parse_M808(char * const cmd);
   static void add_marker(const uint32_t sdpos, const uint16_t count);

Marlin/src/lcd/language/language_en.h

   PROGMEM Language_Str MSG_RESUME_PRINT                    = _UxGT("Resume Print");
   PROGMEM Language_Str MSG_HOST_START_PRINT                = _UxGT("Host Start");
   PROGMEM Language_Str MSG_STOP_PRINT                      = _UxGT("Stop Print");
+  PROGMEM Language_Str MSG_END_LOOPS                       = _UxGT("End Repeat Loops");
   PROGMEM Language_Str MSG_PRINTING_OBJECT                 = _UxGT("Printing Object");
   PROGMEM Language_Str MSG_CANCEL_OBJECT                   = _UxGT("Cancel Object");
   PROGMEM Language_Str MSG_CANCEL_OBJECT_N                 = _UxGT("Cancel Object =");

Marlin/src/lcd/menu/menu_main.cpp

   #include "../../feature/host_actions.h"
 #endif
 
+#if ENABLED(GCODE_REPEAT_MARKERS)
+  #include "../../feature/repeat.h"
+#endif
+
 void menu_tune();
 void menu_cancelobject();
 void menu_motion();
       });
     #endif
 
+    #if ENABLED(GCODE_REPEAT_MARKERS)
+      if (repeat.is_active())
+        ACTION_ITEM(MSG_END_LOOPS, repeat.cancel);
+    #endif
+
     SUBMENU(MSG_TUNE, menu_tune);
 
     #if ENABLED(CANCEL_OBJECTS) && DISABLED(SLIM_LCD_MENUS)