run: Ignore leftover eol-rebase data dir symlink

If the current app data dir is removed, flatpak would try to migrate the
symlink that it had previously created, creating a symlink loop.

Fixes: #5668

common/flatpak-run.c

@@ -3091,6 +3091,12 @@ flatpak_run_app (FlatpakDecomposed *app_ref,
  {
  do_migrate = FALSE; /* Don't migrate older things, they are likely symlinks to this dir */
 
+ /* Don't migrate a symlink pointing to the new data dir. It was likely left over
+ * from a previous migration and would end up pointing to itself */
+ if (g_file_info_get_is_symlink (previous_app_id_dir_info) &&
+ g_strcmp0 (g_file_info_get_symlink_target (previous_app_id_dir_info), app_id) == 0)
+ break;
+
  if (!flatpak_file_rename (previous_app_id_dir, real_app_id_dir, cancellable, &local_error))
  {
  g_warning (_("Failed to migrate old app data directory %s to new name %s: %s"),