fix: Issue 523, 536 to delete duplicate queries and create cost center schema and queries

backend/dataconnect/schema/costCenter.gql

@@ -0,0 +1,7 @@
+type CostCenter @table(name: "cost_centers") {
+  id: UUID! @default(expr: "uuidV4()")
+  name: String!
+  createdAt: Timestamp @default(expr: "request.time")
+  updatedAt: Timestamp @default(expr: "request.time")
+  createdBy: String
+}