Include assignment extraInfo on dates page

src/course-home/data/__factories__/datesTabData.factory.js

@@ -15,6 +15,7 @@ Factory.define('datesTabData')
         learner_has_access: true,
         link: '',
         title: 'Course Starts',
+        extraInfo: '',
       },
     ],
     missed_deadlines: false,

src/course-home/dates-tab/Day.jsx

@@ -59,6 +59,7 @@ function Day({
             <div key={item.title + item.date} className={textColor}>
               <div><span className="font-weight-bold small mt-1">{title}</span>{itemBadges}</div>
               {item.description && <div className="small mb-2">{item.description}</div>}
+              {item.extraInfo && <div className="small mb-2">{item.extraInfo}</div>}
             </div>
           );
         })}