Whole Foods Market Inc. has until the end of June to remedy “serious violations” discovered by federal regulators during a February inspection of a Massachusetts plant that supplies ready-to-eat products across the Northeast. On a long list of problems, FDA inspectors said they found foods like pesto pasta and mushroom quesadillas being prepared or stored in places where condensation was dripping from ceilings, a doorway and a fan. It said the company kept dirty dishes near food, didn’t supply hot water at some hand-washing sinks and allowed high-pressure hoses used for cleaning to spray into areas where foods like couscous and salad dressing were being prepared.