refactor: Improve umount and force_unmount functions for better error handling and output formatting

scripts/umount.sh

@@ -12,6 +12,8 @@ function unmount() {
         else
             echo "Unmount completed: $1"
         fi
+    else
+        echo "$1 is not mounted"
     fi
 }
 
@@ -23,6 +25,8 @@ function force_unmount() {
         else
             echo "Unmount completed: $1"
         fi
+    else
+        echo "$1 is not mounted"
     fi
 }