repart: Rescan after writing partition table on factory reset

If a partition gets removed due to factory reset, we will recreate it
as blkpg later. So it needs to get removed. So rescan is needed to be
done after we write the partition table for factory reset.

Fixes #42453

src/repart/repart.c

@@ -8707,6 +8707,9 @@ static int context_factory_reset(Context *context) {
         if (r < 0)
                 return log_error_errno(r, "Failed to write disk label: %m");
 
+        /* We do not want to stop if partscan has errors */
+        (void) context_partscan(context);
+
         log_info("Successfully deleted %zu partitions.", n);
         return 1;
 }