By Michael Holden and Sam Tobin LONDON (Reuters) – Britain’s Prince Harry will learn on Friday whether he has won his lawsuit against a newspaper publisher over allegations of phone-hacking and other unlawful acts, the biggest ruling so far in his legal war against the British tabloid press. The prince – who became the first senior British royal for 130 years to give evidence in court when he appeared as the star witness at the trial in June – is suing MGN, the publisher of the Daily Mirror, Sunday Mirror and Sunday People. Harry and about 100 other claimants – which include actors, sports sta…