Update re-thrown error for incompatible Java/Gradle versions to include migration guide (#124327)

Update re-thrown error for incompatible Java/Gradle versions to include migration guide

packages/flutter_tools/lib/src/android/gradle_errors.dart

@@ -687,22 +687,12 @@ final GradleHandledError incompatibleJavaAndGradleVersionsHandler = GradleHandle
     required bool usesAndroidX,
     required bool multidexEnabled,
   }) async {
-    final File gradlePropertiesFile = project.directory
-        .childDirectory('android')
-        .childDirectory('gradle')
-        .childDirectory('wrapper')
-        .childFile('gradle-wrapper.properties');
     // TODO(reidbaker): Replace URL with constant defined in
     // https://github.com/flutter/flutter/pull/123916.
     globals.printBox(
       "${globals.logger.terminal.warningMark} Your project's Gradle version "
       'is incompatible with the Java version that Flutter is using for Gradle.\n\n'
-      'To fix this issue, first, check the Java version used by Flutter by '
-      'running `flutter doctor --verbose`.\n\n'
-      'Then, update the Gradle version specified in ${gradlePropertiesFile.path} '
-      'to be compatible with that Java version. '
-      'See the link below for more information on compatible Java/Gradle versions:\n'
-      'https://docs.gradle.org/current/userguide/compatibility.html#java\n\n',
+      'To fix this issue, consult the migration guide at docs.flutter.dev/go/android-java-gradle-error.',
       title: _boxTitle,
     );
     return GradleBuildStatus.exit;

packages/flutter_tools/test/general.shard/android/gradle_errors_test.dart

@@ -1330,7 +1330,7 @@ Could not compile build file '…/example/android/build.gradle'.
 
       // Ensure the error notes the incompatible Gradle/AGP/Java versions and links to related resources.
       expect(testLogger.statusText, contains('Gradle version is incompatible with the Java version'));
-      expect(testLogger.statusText, contains('https://docs.gradle.org/current/userguide/compatibility.html#java'));
+      expect(testLogger.statusText, contains('docs.flutter.dev/go/android-java-gradle-error'));
     }, overrides: <Type, Generator>{
       GradleUtils: () => FakeGradleUtils(),
       Platform: () => fakePlatform('android'),