San Francisco congressional candidate Saikat Chakrabarti made millions in tech, and he’s poured almost $5 million of his own wealth into the race to succeed former House speaker Nancy Pelosi. But that didn’t stop the progressive techie — who’s been weirdly shunned by his former boss, Rep. Alexandria Ocasio-Cortez — from holding a rally to level vulgar attacks at the wealthy elite just a rung or two up the economic ladder. “F–k the oligarchs,” Chakrabarti awkwardly shouted Thursday to a crowd