feat(medusa,types,core-flows): apply created_by values - claims, exchanges, returns, fulfillment (#8712)

what:

- Applies created_by values - claims, exchanges, returns, fulfillment

RESOLVES CC-96

integration-tests/http/__tests__/claims/claims.spec.ts

@@ -1048,6 +1048,8 @@ medusaIntegrationTestRunner({
           )
         ).data.claim
 
+        expect(baseClaim.created_by).toEqual(expect.any(String))
+
         await api.post(
           `/admin/claims/${baseClaim.id}/inbound/items`,
           {

integration-tests/http/__tests__/exchanges/exchanges.spec.ts

@@ -392,6 +392,8 @@ medusaIntegrationTestRunner({
           adminHeaders
         )
 
+        expect(result.data.exchange.created_by).toEqual(expect.any(String))
+
         const exchangeId = result.data.exchange.id
 
         let r2 = await api.post(

integration-tests/http/__tests__/returns/returns.spec.ts

@@ -311,6 +311,8 @@ medusaIntegrationTestRunner({
           adminHeaders
         )
 
+        expect(result.data.return.created_by).toEqual(expect.any(String))
+
         let r2 = await api.post(
           "/admin/returns",
           {