By Gibran Naiyyar Peshimam ISLAMABAD (Reuters) – Former Pakistani Prime Minister Imran Khan’s 10-year jail sentence under the official secrets act is the latest in a series of ups and downs for the charismatic cricket star who is barred from elections next week but looms large over the country’s politics. Khan, 71, has been fighting dozens of cases since he was ousted from power in a parliamentary vote of no confidence in 2022. He was sentenced to three years jail in a corruption case in August, which has ruled him out of the Feb. 8 general elections. Opinion polls early last year said Khan wa…