Jay Halstead and Hailey Upton’s marriage might be in shambles on Chicago P.D., but portrayers Jesse Lee Soffer and Tracy Spiridakos showed a united front on the picket lines. On Monday, Soffer posted Instagram photos with Spiridakos — as well as #OneChicago executive producer Derek Haas — along with the caption, “Team, assemble!!” SAG-AFTRA has been on …