add milestone graphql

src/components/EngagementDataGrid/engagementDataGridRow.graphql

@@ -48,6 +48,9 @@ fragment engagementDataGridRow on Engagement {
         }
       }
     }
+    milestoneReached {
+      value
+    }
     language {
       value {
         id

src/scenes/Engagement/LanguageEngagement/LanguageEngagementDetail.graphql

@@ -5,6 +5,7 @@ fragment LanguageEngagementDetail on LanguageEngagement {
   ...EngagementPlanningSpreadsheet
   ...LanguageEngagementDatesForm
   ...EngagementDescription
+  ...engagementMilestoneReached
   ceremony {
     ...CeremonyCard
   }

src/scenes/Engagement/LanguageEngagement/Milestone/Milestone.graphql

@@ -0,0 +1,8 @@
+fragment engagementMilestoneReached on LanguageEngagement {
+  ...Id
+  milestoneReached {
+    canRead
+    canEdit
+    value
+  }
+}