TALLAHASSEE, Fla. — Florida Republicans are poised to bar the state from doing business with companies that bring undocumented immigrants into the state, a move that Democrats and faith leaders across the state worry will complicate the resettlement of unaccompanied minors who come to Florida to be reunified with their families. The proposal — approved by the Senate on Thursday along party lines — seeks to cramp the flow of undocumented immigrants into the state by targeting companies that transport people who are “unlawfully” in the country into Florida. Unaccompanied migrant children, who un…