refactor(tests): replace 'final' with 'const' for improved performance in various test files

test/features/diets/presentation/widgets/info_bouble_test.dart

@@ -9,7 +9,7 @@ void main() {
       await tester.pumpWidget(
         MaterialApp(
           theme: ThemeHelper().themeData(),
-          home: Scaffold(
+          home: const Scaffold(
             body: InfoBouble(
               children: [
                 Text('Test'),
@@ -29,7 +29,7 @@ void main() {
       await tester.pumpWidget(
         MaterialApp(
           theme: ThemeHelper().themeData(),
-          home: Scaffold(
+          home: const Scaffold(
             body: InfoBouble(
               backgroundColor: Colors.blue,
               children: [
@@ -47,7 +47,7 @@ void main() {
       await tester.pumpWidget(
         MaterialApp(
           theme: ThemeHelper().themeData(),
-          home: Scaffold(
+          home: const Scaffold(
             body: InfoBouble(
               radius: 20,
               children: [
@@ -65,7 +65,7 @@ void main() {
       await tester.pumpWidget(
         MaterialApp(
           theme: ThemeHelper().themeData(),
-          home: Scaffold(
+          home: const Scaffold(
             body: InfoBouble(
               padding: EdgeInsets.all(16),
               children: [
@@ -83,7 +83,7 @@ void main() {
       await tester.pumpWidget(
         MaterialApp(
           theme: ThemeHelper().themeData(),
-          home: Scaffold(
+          home: const Scaffold(
             body: InfoBouble(
               mainAxisAlignment: MainAxisAlignment.center,
               children: [

test/features/diets/presentation/widgets/more_options_test.dart

@@ -27,7 +27,7 @@ void main() {
     }) {
       return MaterialApp(
         theme: ThemeHelper().themeData(),
-        localizationsDelegates: [
+        localizationsDelegates: const [
           S.delegate,
           GlobalMaterialLocalizations.delegate,
           GlobalWidgetsLocalizations.delegate,