WORCESTER — The architect that developer James E. Levin hired for the rehabilitation project at 5 May St. testified in federal court Monday that he never signed off on any reimbursement forms on Levin’s behalf out of concerns for the integrity of the process. Steven Petitpas, a longtime Boston architect, testified that he refused to sign the first reimbursement form he was forwarded after noticing an inaccurate statement, and was never again asked to approve any similar forms. “You can’t certify (work) that hasn’t been done, because you shouldn’t get paid for it,” Petitpas ...