By Kevin Yao BEIJING (Reuters) – China’s next premier, who will take office in March, will have few options but to step up stimulus to revive an economy ravaged by COVID-19, policy insiders and analysts said on Monday, as the unveiling of Xi Jinping’s new leadership team rattled markets. On Sunday, Xi was confirmed for a precedent-breaking third term as president and introduced a Politburo Standing Committee stacked with loyalists including Li Qiang, the Shanghai Communist Party chief who is now in line to succeed Li Keqiang as premier. Li Qiang will have the job of driving growth to fend off …