Fixed repeated strings for incompatible Gradle or AGP version in create command (#161223)

Fixed the repeated string which shows the compatible Java version in the
create command.

<img width="1003" alt="image"
src="https://github.com/user-attachments/assets/143634ef-fb36-40ce-8934-a5237d574821"
/>


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packages/flutter_tools/lib/src/commands/create.dart

@@ -1155,9 +1155,8 @@ String getIncompatibleJavaGradleAgpMessageHeader(
   return '''
 The configured version of Java detected may conflict with the $incompatibleDependency version in your new Flutter $projectType.
 
-To keep the default AGP version $incompatibleDependencyVersion, download a compatible Java version
-(Java 17 <= $validJavaRangeMessage Java version < Java 21). Configure this Java version
-globally for Flutter by running:
+To keep the default $incompatibleDependencyVersion, download a compatible Java version
+$validJavaRangeMessage. Configure this Java version globally for Flutter by running:
 
   flutter config --jdk-dir=<JDK_DIRECTORY>
 ''';

packages/flutter_tools/test/commands.shard/permeable/create_test.dart

@@ -4457,6 +4457,44 @@ void main() {
     overrides: <Type, Generator>{Java: () => null, Logger: () => logger},
   );
 
+  testUsingContext('should return correct warning for incompatible Gradle versions', () async {
+    const String projectType = 'app';
+    final String gradleConflict = getIncompatibleJavaGradleAgpMessageHeader(
+      false,
+      templateDefaultGradleVersion,
+      templateAndroidGradlePluginVersion,
+      projectType,
+    );
+
+    expect(
+      gradleConflict,
+      contains('''
+The configured version of Java detected may conflict with the Gradle version in your new Flutter $projectType.
+
+To keep the default Gradle version $templateDefaultGradleVersion, download a compatible Java version
+'''),
+    );
+  });
+
+  testUsingContext('should return correct warning for incompatible AGP versions', () async {
+    const String projectType = 'app';
+    final String agpConflict = getIncompatibleJavaGradleAgpMessageHeader(
+      true,
+      templateDefaultGradleVersion,
+      templateAndroidGradlePluginVersion,
+      projectType,
+    );
+
+    expect(
+      agpConflict,
+      contains('''
+The configured version of Java detected may conflict with the Android Gradle Plugin (AGP) version in your new Flutter $projectType.
+
+To keep the default AGP version $templateAndroidGradlePluginVersion, download a compatible Java version
+'''),
+    );
+  });
+
   testUsingContext(
     'should not show warning for incompatible Java/template Gradle versions when created project type is irrelevant',
     () async {