Upload logs before failing module_test_ios (#76341)

dev/devicelab/bin/tasks/module_test_ios.dart

@@ -295,12 +295,11 @@ Future<void> main() async {
       section('Run platform unit tests');
 
       final String resultBundleTemp = Directory.systemTemp.createTempSync('module_test_ios_xcresult.').path;
-      await testWithNewIOSSimulator('TestAdd2AppSim', (String deviceId) {
+      await testWithNewIOSSimulator('TestAdd2AppSim', (String deviceId) async {
         simulatorDeviceId = deviceId;
         final String resultBundlePath = path.join(resultBundleTemp, 'result');
 
-        return inDirectory(objectiveCHostApp, () =>
-          exec(
+        final int testResultExit = await exec(
           'xcodebuild',
           <String>[
             '-workspace',
@@ -320,10 +319,11 @@ Future<void> main() async {
             'EXPANDED_CODE_SIGN_IDENTITY=-',
             'COMPILER_INDEX_STORE_ENABLE=NO',
           ],
-          ));
-        }
+          workingDirectory: objectiveCHostApp.path,
+          canFail: true,
         );
 
+        if (testResultExit != 0) {
           // Zip the test results to the artifacts directory for upload.
           await inDirectory(resultBundleTemp, () {
             final String zipPath = path.join(hostAgent.dumpDirectory.path,
@@ -340,6 +340,10 @@ Future<void> main() async {
             );
           });
 
+          throw TaskResult.failure('Platform unit tests failed');
+        }
+      });
+
       section('Fail building existing Objective-C iOS app if flutter script fails');
       final String xcodebuildOutput = await inDirectory<String>(objectiveCHostApp, () =>
         eval(