fix(api): populate the auth mode when parsing the request response. So AppSyncListProvider.getNextPage() will have the auth mode. (#4156)

Co-authored-by: shin <shin@shins-MacBook-Air.local>

Author: shinping2

AmplifyPlugins/API/Sources/AWSAPIPlugin/Core/AppSyncListProvider.swift

@@ -59,6 +59,7 @@ public class AppSyncListProvider<Element: Model>: ModelListProvider {
             elements: listResponse.items,
             nextToken: listResponse.nextToken,
             apiName: payload.apiName,
+            authMode: payload.authMode,
             limit: payload.limit,
             filter: payload.graphQLFilter
         )

AmplifyPlugins/API/Tests/AWSAPIPluginTests/Core/AppSyncListProviderTests.swift

@@ -62,7 +62,7 @@ class AppSyncListProviderTests: XCTestCase {
         let appSyncPayload = AppSyncListPayload(
             graphQLData: json,
             apiName: "apiName",
-            authMode: nil,
+            authMode: .amazonCognitoUserPools,
             variables: variables
         )
         let provider = try AppSyncListProvider<Post4>(payload: appSyncPayload)
@@ -73,6 +73,7 @@ class AppSyncListProviderTests: XCTestCase {
         XCTAssertEqual(elements.count, 2)
         XCTAssertEqual(nextToken, "nextToken")
         XCTAssertEqual(provider.apiName, "apiName")
+        XCTAssertEqual(provider.authMode, .amazonCognitoUserPools)
         XCTAssertEqual(provider.limit, 500)
         XCTAssertNotNil(filter)
     }