AURORA — The metro area’s affordable housing crisis was laid bare once again this week, with a battle over a low-income housing project in Aurora bringing dozens of people out to city hall until the early hours of Tuesday morning. In the end, the vote couldn’t have been closer, with Aurora City Council voting 6-5 early Tuesday morning to approve the proposed 50-unit Providence at the Heights after hearing nearly five hours of testimony from residents on both sides of the issue. Many neighbors who live near the site where Providence would be built — behind Elevation Christian Church at the southwest corner of Alameda Parkway and Joplin Street — said the 1.4-acre plot was too small for the three-story structure.