[CP-stable]Assert macOS framework artifact contains xcprivacy manifest (

flutter#155556)

This is the framework-side test for flutter/engine#55366.  This test will fail unless it is run on a roll containing that fix.

### Issue Link:
flutter#154915

### Changelog Description:
Test that a built macOS app contains the FlutterMacOS framework privacy manifest and validates flutter/engine#55366.

### Impact Description:
Adds confidence the Flutter macOS engine framework contains the expected privacy manifest at the right path.

### Workaround:
N/A

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
Run the flutter_tool tests

bin/internal/engine.version

@@ -1 +1 @@
-36335019a8eab588c3c2ea783c618d90505be233
+db49896cf25ceabc44096d5f088d86414e05a7aa

packages/flutter_tools/test/host_cross_arch.shard/macos_content_validation_test.dart

@@ -196,6 +196,19 @@ void main() {
       expect(outputFlutterFramework.childLink('Modules'), isNot(exists));
       expect(outputFlutterFramework.childDirectory('Modules'), isNot(exists));
 
+      // PrivacyInfo.xcprivacy was first added to the top-level path, but
+      // the correct location is Versions/A/Resources/PrivacyInfo.xcprivacy.
+      // TODO(jmagman): Switch expectation to only check Resources/ once the new path rolls.
+      // https://github.com/flutter/flutter/issues/157016#issuecomment-2420786225
+      final File topLevelPrivacy =  outputFlutterFramework.childFile('PrivacyInfo.xcprivacy');
+      final File resourcesLevelPrivacy = fileSystem.file(fileSystem.path.join(
+        outputFlutterFramework.path,
+        'Resources',
+        'PrivacyInfo.xcprivacy',
+      ));
+
+      expect(topLevelPrivacy.existsSync() || resourcesLevelPrivacy.existsSync(), isTrue);
+
       // Build again without cleaning.
       final ProcessResult secondBuild = processManager.runSync(buildCommand, workingDirectory: workingDirectory);