Remove message about `pub cache` that is not actionable (#143357)

... and neither the pub nor tools team think it's important.

Fixes https://github.com/flutter/flutter/issues/140628.

packages/flutter_tools/lib/src/dart/pub.dart

@@ -609,7 +609,6 @@ class _DefaultPub implements Pub {
       /// We only want to inform about existing caches on first run of a freshly
       /// downloaded Flutter SDK. Therefore it is conditioned on the existence
       /// of the .pub-preload-cache dir.
-      _informAboutExistingCaches();
       final Iterable<String> cacheFiles =
             preloadCacheDir
               .listSync()
@@ -620,50 +619,6 @@ class _DefaultPub implements Pub {
     }
   }
 
-  /// Issues a log message if there is an existing pub cache and or an existing
-  /// Dart Analysis Server cache.
-  void _informAboutExistingCaches() {
-    final String? pubCachePath = _pubCacheDefaultLocation();
-    if (pubCachePath != null) {
-      final Directory pubCacheDirectory = _fileSystem.directory(pubCachePath);
-      if (pubCacheDirectory.existsSync()) {
-        _logger.printStatus('''
-Found an existing Pub cache at $pubCachePath.
-It can be repaired by running `dart pub cache repair`.
-It can be reset by running `dart pub cache clean`.''');
-      }
-    }
-    final String? home = _platform.environment['HOME'];
-    if (home != null) {
-      final String dartServerCachePath = _fileSystem.path.join(home, '.dartServer');
-      if (_fileSystem.directory(dartServerCachePath).existsSync()) {
-        _logger.printStatus('''
-Found an existing Dart Analysis Server cache at $dartServerCachePath.
-It can be reset by deleting $dartServerCachePath.''');
-        }
-      }
-  }
-
-  /// The default location of the Pub cache if the PUB_CACHE environment variable
-  /// is not set.
-  ///
-  /// Returns null if the appropriate environment variables are unset.
-  String? _pubCacheDefaultLocation () {
-    if (_platform.isWindows) {
-      final String? localAppData = _platform.environment['LOCALAPPDATA'];
-      if (localAppData == null) {
-        return null;
-      }
-      return _fileSystem.path.join(localAppData, 'Pub', 'Cache');
-    } else {
-      final String? home = _platform.environment['HOME'];
-      if (home == null) {
-        return null;
-      }
-      return _fileSystem.path.join(home, '.pub-cache');
-    }
-  }
-
   /// The full environment used when running pub.
   ///
   /// [context] provides extra information to package server requests to

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

@@ -866,98 +866,11 @@ exit code: 66
     await pub.get(
         project: FlutterProject.fromDirectoryTest(fileSystem.currentDirectory),
         context: PubContext.flutterTests);
-    expect(logger.statusText, isNot(contains('Found an existing Pub cache')));
-    expect(logger.statusText,
-        isNot(contains('Found an existing Dart Analysis Server cache')));
 
     expect(processManager, hasNoRemainingExpectations);
     expect(preloadCache.existsSync(), false);
   });
 
-  testWithoutContext('Notifies about existing caches, on first run only',
-      () async {
-    final FileSystem fileSystem = MemoryFileSystem.test();
-    final Directory preloadCache =
-        fileSystem.currentDirectory.childDirectory('.pub-preload-cache');
-    preloadCache.childFile('a.tar.gz').createSync(recursive: true);
-    fileSystem.currentDirectory.childFile('version').createSync();
-    fileSystem.directory('/global/.pub-cache').createSync(recursive: true);
-    fileSystem.directory('/global/.dartServer').createSync(recursive: true);
-
-    const FakeCommand dartPreloadCommand = FakeCommand(
-      command: <String>[
-        'bin/cache/dart-sdk/bin/dart',
-        'pub',
-        '--suppress-analytics',
-        'cache',
-        'preload',
-        '.pub-preload-cache/a.tar.gz',
-      ],
-    );
-    final FakeCommand dartPubGetCommand = FakeCommand(
-        command: const <String>[
-          'bin/cache/dart-sdk/bin/dart',
-          'pub',
-          '--suppress-analytics',
-          '--directory',
-          '.',
-          'get',
-          '--example',
-        ],
-        environment: const <String, String>{
-          'FLUTTER_ROOT': '',
-          'PUB_ENVIRONMENT': 'flutter_cli:flutter_tests',
-        },
-        onRun: (_) {
-          fileSystem.currentDirectory
-              .childDirectory('.dart_tool')
-              .childFile('package_config.json')
-              .createSync(recursive: true);
-        });
-
-    final FakeProcessManager processManager =
-        FakeProcessManager.list(<FakeCommand>[
-      dartPreloadCommand,
-      dartPubGetCommand,
-      dartPubGetCommand,
-    ]);
-
-    final Platform platform =
-        FakePlatform(environment: <String, String>{'HOME': '/global'});
-    final BufferLogger logger = BufferLogger.test();
-    final Pub pub = Pub.test(
-      platform: platform,
-      usage: TestUsage(),
-      fileSystem: fileSystem,
-      logger: logger,
-      processManager: processManager,
-      botDetector: const BotDetectorAlwaysNo(),
-      stdio: FakeStdio(),
-    );
-
-    await pub.get(
-        project: FlutterProject.fromDirectoryTest(fileSystem.currentDirectory),
-        context: PubContext.flutterTests);
-    expect(logger.statusText,
-        contains('Found an existing Pub cache at /global/.pub-cache'));
-    expect(logger.statusText,
-        contains('It can be reset by running `dart pub cache clean`'));
-    expect(
-      logger.statusText,
-      contains(
-          'Found an existing Dart Analysis Server cache at /global/.dartServer'),
-    );
-    expect(preloadCache.existsSync(), false);
-    logger.clear();
-    await pub.get(
-        project: FlutterProject.fromDirectoryTest(fileSystem.currentDirectory),
-        context: PubContext.flutterTests);
-    expect(logger.statusText, isNot(contains('Found an existing Pub cache')));
-    expect(logger.statusText,
-        isNot(contains('Found an existing Dart Analysis Server cache')));
-    expect(processManager, hasNoRemainingExpectations);
-  });
-
   testWithoutContext('pub cache in environment is used', () async {
     final FileSystem fileSystem = MemoryFileSystem.test();
     fileSystem.directory('custom/pub-cache/path').createSync(recursive: true);