Lefty love machine Bill de Blasio is throwing his jilted ex-gal pal Nomiki Konst a bone — endorsing her client Michael Blake’s insurgent bid to topple Bronx Rep. Ritchie Torres (D-NY). Konst, a 41-year-old progressive activist — whom sources exclusively told The Post de Blasio abandoned for a fling with South Tucson Mayor Roxanna Valenzuela — is working as a strategist and spokesperson for Blake’s campaign taking on Torres in next June’s Democratic primary. De Blasio, 64, an ally of Mayor-elect