By Giuseppe Fonte and Gavin Jones ROME (Reuters) -Italy on Wednesday slashed its growth estimate for this year as the war in Ukraine weighs on the economy, while confirming a previous budget deficit target of 5.6% of national output. The Treasury’s annual Economic and Financial Document (DEF) forecasts gross domestic product in the euro zone’s third largest economy will grow by 3.1%, down from a 4.7% projection made last September. For 2023, the government sees GDP growth of 2.4%, down from the previous target of 2.8%. “It’s clear the war has caused a weakening of the outlook,” Prime Minister …