[CP-stable]Add xcprivacy privacy manifest to macOS framework (#55366)

### Issue Link:

flutter/flutter#154915

### Changelog Description:

Comply with the new Apple privacy manifest policy for the macOS Flutter engine framework and prevent the "Missing privacy manifest" warning when submitting a macOS app to the App Store.

### Impact Description:

The macOS App Store will start enforcing privacy manifests for third-party SDKs starting November 12, 2024.  This change adds an empty privacy manifest to the Flutter engine FlutterMacOS.framework to comply with this new policy and prevents the warning.

### Workaround:
Add an empty PrivacyInfo.xcprivacy plist to FlutterMacOS.framework and re-codesign it manually.

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

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

A test was added to the framework, which should also be cherry-picked flutter/flutter#155556.
While we can confirm the expected file is present, only a TestFlight/App Store submission will confirm the warning is gone.

### Validation Steps:
Submit a Flutter macOS app to TestFlight or the App Store.  Confirm there is no submission warning email sent.

Author: flutteractionsbot

ci/licenses_golden/licenses_flutter

@@ -46536,6 +46536,7 @@ FILE: ../../../flutter/shell/platform/darwin/macos/framework/Headers/FlutterPlug
 FILE: ../../../flutter/shell/platform/darwin/macos/framework/Headers/FlutterPluginRegistrarMacOS.h
 FILE: ../../../flutter/shell/platform/darwin/macos/framework/Headers/FlutterViewController.h
 FILE: ../../../flutter/shell/platform/darwin/macos/framework/Info.plist
+FILE: ../../../flutter/shell/platform/darwin/macos/framework/PrivacyInfo.xcprivacy
 FILE: ../../../flutter/shell/platform/darwin/macos/framework/Source/AccessibilityBridgeMac.h
 FILE: ../../../flutter/shell/platform/darwin/macos/framework/Source/AccessibilityBridgeMac.mm
 FILE: ../../../flutter/shell/platform/darwin/macos/framework/Source/AccessibilityBridgeMacTest.mm

shell/platform/darwin/macos/BUILD.gn

@@ -248,6 +248,15 @@ copy("copy_framework_module_map") {
   outputs = [ "$_flutter_framework_dir/Versions/A/Modules/module.modulemap" ]
 }
 
+# Copy privacy manifest. This file is required by Apple for third-party SDKs.
+# See https://developer.apple.com/documentation/bundleresources/privacy_manifest_files
+copy("copy_framework_privacy_manifest") {
+  visibility = [ ":*" ]
+  sources = [ "framework/PrivacyInfo.xcprivacy" ]
+  outputs =
+      [ "$_flutter_framework_dir/Versions/A/Resources/PrivacyInfo.xcprivacy" ]
+}
+
 action("copy_framework_headers") {
   script = "//flutter/sky/tools/install_framework_headers.py"
   visibility = [ ":*" ]
@@ -304,6 +313,7 @@ action("_generate_symlinks") {
     ":copy_framework_icu",
     ":copy_framework_info_plist",
     ":copy_framework_module_map",
+    ":copy_framework_privacy_manifest",
     ":copy_license",
   ]
   metadata = {

shell/platform/darwin/macos/framework/PrivacyInfo.xcprivacy

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSPrivacyTracking</key>
+	<false/>
+	<key>NSPrivacyTrackingDomains</key>
+	<array/>
+	<key>NSPrivacyCollectedDataTypes</key>
+	<array/>
+</dict>
+</plist>