feat(core-flows,fulfillment, fulfillment-manual, types): make fulfillment typings more specific (#10677)

**What**
- attempt to add more specific type definitions around fulfillment provider APIs

---

CLOSES CMRC-814
CLOSES CMRC-816
CLOSES CMRC-817

integration-tests/http/src/utils/providers/fulfillment-manual-calculated/services/manual-fulfillment.ts

@@ -41,7 +41,10 @@ export class ManualFulfillmentService extends AbstractFulfillmentProviderService
 
   async createFulfillment() {
     // No data is being sent anywhere
-    return {}
+    return {
+      data: {},
+      labels: [],
+    }
   }
 
   async cancelFulfillment() {
@@ -49,6 +52,6 @@ export class ManualFulfillmentService extends AbstractFulfillmentProviderService
   }
 
   async createReturnFulfillment() {
-    return {}
+    return { data: {}, labels: [] }
   }
 }