feat(app-check)!: remove deprecated functions (#17561)

Removed SafetyNet, check here for more informations: https://developer.android.com/privacy-and-security/safetynet/deprecation-timeline

Author: Lyokone

packages/firebase_app_check/firebase_app_check/android/build.gradle

@@ -67,8 +67,6 @@ android {
     implementation 'com.google.firebase:firebase-appcheck-debug'
     implementation 'com.google.firebase:firebase-appcheck-playintegrity'
     implementation 'androidx.annotation:annotation:1.7.0'
-    // SafetyNet is deprecated and not part of Firebase BOM
-    implementation 'com.google.firebase:firebase-appcheck-safetynet:16.1.2'
 
   }
 }

packages/firebase_app_check/firebase_app_check/android/src/main/java/io/flutter/plugins/firebase/appcheck/FlutterFirebaseAppCheckPlugin.java

@@ -16,7 +16,6 @@
 import com.google.firebase.appcheck.FirebaseAppCheck;
 import com.google.firebase.appcheck.debug.DebugAppCheckProviderFactory;
 import com.google.firebase.appcheck.playintegrity.PlayIntegrityAppCheckProviderFactory;
-import com.google.firebase.appcheck.safetynet.*;
 import io.flutter.embedding.engine.plugins.FlutterPlugin;
 import io.flutter.plugin.common.BinaryMessenger;
 import io.flutter.plugin.common.EventChannel;
@@ -36,7 +35,6 @@ public class FlutterFirebaseAppCheckPlugin
   private final Map<EventChannel, TokenChannelStreamHandler> streamHandlers = new HashMap<>();
 
   private final String debugProvider = "debug";
-  private final String safetyNetProvider = "safetyNet";
   private final String playIntegrity = "playIntegrity";
 
   @Nullable private BinaryMessenger messenger;
@@ -88,8 +86,6 @@ private Task<String> getLimitedUseAppCheckToken(Map<String, Object> arguments) {
     return taskCompletionSource.getTask();
   }
 
-  // SafetyNet is deprecated and is already annotated as such on the user facing Dart API. Please remove annotation when SafetyNet is removed.
-  @SuppressWarnings("deprecation")
   private Task<Void> activate(Map<String, Object> arguments) {
     TaskCompletionSource<Void> taskCompletionSource = new TaskCompletionSource<>();
 
@@ -106,13 +102,6 @@ private Task<Void> activate(Map<String, Object> arguments) {
                       DebugAppCheckProviderFactory.getInstance());
                   break;
                 }
-              case safetyNetProvider:
-                {
-                  FirebaseAppCheck firebaseAppCheck = getAppCheck(arguments);
-                  firebaseAppCheck.installAppCheckProviderFactory(
-                      SafetyNetAppCheckProviderFactory.getInstance());
-                  break;
-                }
               case playIntegrity:
                 {
                   FirebaseAppCheck firebaseAppCheck = getAppCheck(arguments);

packages/firebase_app_check/firebase_app_check_platform_interface/lib/src/android_provider.dart

@@ -6,11 +6,6 @@
 enum AndroidProvider {
   // The debug provider
   debug,
-  // The safety net provider (deprecated)
-  @Deprecated(
-    'Safety Net provider is deprecated and will be removed in a future release. Play Integrity is the recommended provider.',
-  )
-  safetyNet,
   // The play integrity provider (Firebase recommended)
   playIntegrity
 }

packages/firebase_app_check/firebase_app_check_platform_interface/lib/src/method_channel/utils/provider_to_string.dart

@@ -8,9 +8,6 @@ import 'package:firebase_app_check_platform_interface/src/apple_provider.dart';
 /// Converts [AndroidProvider] to [String]
 String getAndroidProviderString(AndroidProvider? provider) {
   switch (provider) {
-    // ignore: deprecated_member_use_from_same_package
-    case AndroidProvider.safetyNet:
-      return 'safetyNet';
     case AndroidProvider.debug:
       return 'debug';
     case AndroidProvider.playIntegrity: