Clean up null safety messages (#120350)

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

@@ -110,13 +110,8 @@ abstract class BuildSubCommand extends FlutterCommand {
   /// This is similar to the run message in run_hot.dart
   @protected
   void displayNullSafetyMode(BuildInfo buildInfo) {
-    _logger.printStatus('');
-    if (buildInfo.nullSafetyMode == NullSafetyMode.sound) {
-      _logger.printStatus(
-        '💪 Building with sound null safety 💪',
-        emphasis: true,
-      );
-    } else {
+    if (buildInfo.nullSafetyMode != NullSafetyMode.sound) {
+      _logger.printStatus('');
       _logger.printStatus(
         'Building without sound null safety ⚠️',
         emphasis: true,

packages/flutter_tools/lib/src/isolated/resident_web_runner.dart

@@ -608,10 +608,8 @@ class ResidentWebRunner extends ResidentRunner {
           ..writeAsStringSync(websocketUri.toString());
       }
       _logger.printStatus('Debug service listening on $websocketUri');
-      _logger.printStatus('');
-      if (debuggingOptions.buildInfo.nullSafetyMode ==  NullSafetyMode.sound) {
-        _logger.printStatus('💪 Running with sound null safety 💪', emphasis: true);
-      } else {
+      if (debuggingOptions.buildInfo.nullSafetyMode !=  NullSafetyMode.sound) {
+        _logger.printStatus('');
         _logger.printStatus(
           'Running without sound null safety ⚠️',
           emphasis: true,

packages/flutter_tools/lib/src/run_hot.dart

@@ -1029,10 +1029,8 @@ class HotRunner extends ResidentRunner {
     }
     commandHelp.c.print();
     commandHelp.q.print();
-    globals.printStatus('');
-    if (debuggingOptions.buildInfo.nullSafetyMode ==  NullSafetyMode.sound) {
-      globals.printStatus('💪 Running with sound null safety 💪', emphasis: true);
-    } else {
+    if (debuggingOptions.buildInfo.nullSafetyMode !=  NullSafetyMode.sound) {
+      globals.printStatus('');
       globals.printStatus(
         'Running without sound null safety ⚠️',
         emphasis: true,

packages/flutter_tools/test/general.shard/commands/build_test.dart

@@ -105,21 +105,11 @@ void main() {
       nullSafetyMode: NullSafetyMode.unsound,
       treeShakeIcons: false,
     );
-    const BuildInfo sound = BuildInfo(
-      BuildMode.debug,
-      '',
-      treeShakeIcons: false,
-    );
 
     final BufferLogger logger = BufferLogger.test();
     FakeBuildSubCommand(logger).test(unsound);
     expect(logger.statusText,
         contains('Building without sound null safety ⚠️'));
-
-    logger.clear();
-    FakeBuildSubCommand(logger).test(sound);
-    expect(logger.statusText,
-        contains('💪 Building with sound null safety 💪'));
   });
 
   testUsingContext('Include only supported sub commands', () {

packages/flutter_tools/test/general.shard/resident_runner_test.dart

@@ -1492,8 +1492,6 @@ flutter:
           commandHelp.c,
           commandHelp.q,
           '',
-          '💪 Running with sound null safety 💪',
-          '',
           'An Observatory debugger and profiler on FakeDevice is available at: null',
           '',
         ].join('\n')
@@ -1523,8 +1521,6 @@ flutter:
           commandHelp.c,
           commandHelp.q,
           '',
-          '💪 Running with sound null safety 💪',
-          '',
           'An Observatory debugger and profiler on FakeDevice is available at: null',
           '',
         ].join('\n')

packages/flutter_tools/test/general.shard/resident_web_runner_test.dart

@@ -547,8 +547,6 @@ void main() {
       'Waiting for connection from debug service on FakeDevice...\n'
       'Debug service listening on ws://127.0.0.1/abcd/\n'
       '\n'
-      '💪 Running with sound null safety 💪\n'
-      '\n'
       'first\n'
       '\n'
       'second\n'

packages/flutter_tools/test/integration.shard/overall_experience_test.dart

@@ -591,8 +591,6 @@ void main() {
       'c Clear the screen',
       'q Quit (terminate the application on the device).',
       '',
-      contains('Running with sound null safety'),
-      '',
       startsWith('An Observatory debugger and profiler on Flutter test device is available at: http://'),
       startsWith('The Flutter DevTools debugger and profiler on Flutter test device is available at: http://'),
       '',
@@ -620,8 +618,6 @@ void main() {
       'c Clear the screen',
       'q Quit (terminate the application on the device).',
       '',
-      contains('Running with sound null safety'),
-      '',
       startsWith('An Observatory debugger and profiler on Flutter test device is available at: http://'),
       startsWith('The Flutter DevTools debugger and profiler on Flutter test device is available at: http://'),
       '',