By Riham Alkousaa BERLIN (Reuters) -Germans went to the polls in Germany’s most populous state on Sunday in a vote that poses an early test for Chancellor Olaf Scholz’s Social Democrats five months after he took office with a domestic policy focus that was quickly eclipsed by the Ukraine conflict. The centre-left Social Democrats (SPD) have dominated North Rhine-Westphalia (NRW) — home to more than a fifth of Germany’s population and to the rust-belt Ruhr region — for most of the past half century. But the party lost to former Chancellor Angela Merkel’s conservatives (CDU) in its worst state…