Issue #3510939: Avoid registering multiple batch sets with node_access_rebuild()'s batch mode

When node_access_rebuild(TRUE) is called multiple times per request, it registers as many batch sets as the number of times the function was called. This can lead to unnecessary long node access rebuild processes, because triggering the operation once per request is enough.

This fix ensures that the node_access_rebuild() related batch set is only registered once per request.