By Lucy Raitano LONDON (Reuters) – Sterling rallied on Thursday and investors reined in their bets on a big Bank of England interest rate hike in November as UK Prime Minister Liz Truss announced her resignation just six weeks after she was appointed. Truss’ economic programme had sent shockwaves through the markets and divided her Conservative Party, contributing to a sharp a selloff in UK assets. Pressure on the prime minister had been mounting in recent days and a leadership election will be completed within the next week. The pound, which had rallied ahead of Thursday’s news, was last up 0…