Interior of a modern data center. (Stock photo by Imaginima/Getty Images)Plans for a data center at the former paper mill in Jay are on hold after the data center company pulled out of the project — just two months after Gov. Janet Mills cited the project as her reason for vetoing a statewide data center moratorium. Town officials posted on Facebook that the company that owns the mill, JGT2, notified the town that Sentinel Data Centers would not…