By Ben Blanchard TAIPEI (Reuters) – Taiwan President Tsai Ing-wen said on Saturday her mission in life was to ensure the island continued to belong to its people and that Taiwan’s existence was a provocation to no one, in a fiery pre-election rebuff to China. Taiwan’s Nov. 26 local elections come a month after Chinese President Xi Jinping, who has ramped up military pressure on the democratically-governed island to accept Beijing’s sovereignty, secured a precedent-breaking third leadership term. While the vote for mayors and councillors is nominally about domestic issues, Tsai told thousands o…