[tool] Skip non-plugin packages in FTL command (#3209)

The `firebase-test-lab` expectations were written for flutter/plugins,
where everything was supposed to have an integration test. This makes
non-plugin packages skip, not fail, if they don't have native
Android integration tests.

Fixes https://github.com/flutter/flutter/issues/120450

script/configs/exclude_integration_android.yaml

@@ -1,11 +1 @@
-# Manually exclude all non-plugin packages until
+[]
-# https://github.com/flutter/flutter/issues/120450
-# is fixed.
-- animations
-- dynamic_layouts
-- extension_google_sign_in_as_googleapis_auth
-- flutter_adaptive_scaffold
-- flutter_markdown
-- go_router
-- palette_generator
-- rfw

script/tool/lib/src/firebase_test_lab_command.dart

@@ -12,6 +12,7 @@ import 'package:uuid/uuid.dart';
 import 'common/core.dart';
 import 'common/gradle.dart';
 import 'common/package_looping_command.dart';
+import 'common/plugin_utils.dart';
 import 'common/process_runner.dart';
 import 'common/repository_package.dart';
 
@@ -158,8 +159,13 @@ class FirebaseTestLabCommand extends PackageLoopingCommand {
         .childDirectory('androidTest');
     if (!uiTestDirectory.existsSync()) {
       printError('No androidTest directory found.');
+      if (isFlutterPlugin(package)) {
         return PackageResult.fail(
             <String>['No tests ran (use --exclude if this is intentional).']);
+      } else {
+        return PackageResult.skip(
+            '${example.displayName} has no native Android tests.');
+      }
     }
 
     // Ensure that the Dart integration tests will be run, not just native UI

script/tool/test/firebase_test_lab_command_test.dart

@@ -420,7 +420,7 @@ public class MainActivityTest {
       );
     });
 
-    test('fails for packages with no androidTest directory', () async {
+    test('fails for plugins with no androidTest directory', () async {
       createFakePlugin('plugin', packagesDir, extraFiles: <String>[
         'example/integration_test/foo_test.dart',
         'example/android/gradlew',
@@ -452,6 +452,30 @@ public class MainActivityTest {
       );
     });
 
+    test('skips for non-plugin packages with no androidTest directory',
+        () async {
+      createFakePackage('a_package', packagesDir, extraFiles: <String>[
+        'example/integration_test/foo_test.dart',
+        'example/android/gradlew',
+      ]);
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'firebase-test-lab',
+        '--device',
+        'model=redfin,version=30',
+      ]);
+
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains('Running for a_package'),
+          contains('No androidTest directory found.'),
+          contains('No examples support Android.'),
+          contains('Skipped 1 package'),
+        ]),
+      );
+    });
+
     test('fails for packages with no integration test files', () async {
       const String javaTestFileRelativePath =
           'example/android/app/src/androidTest/MainActivityTest.java';