By Elizabeth PineauSARCELLES, France, June 2 (Reuters) - When Bassi Konate became mayor of Sarcelles this spring, the independent candidate backed by the hard-left France Unbowed (LFI) party ended three decades of municipal rule by the Socialists, the traditional powerhouse of the French left.A native of Sarcelles, a poor, multi-cultural town north of Paris, Konate, 38, leveraged his hometown roots and a network of rappers, soccer stars and influencers to mobilise young voters through social media and canvassing.Konate, who is of Malian heritage, said his election reflected the diversity of modern France."Sarcelles is the most beautiful city in the world...