Revert "[flutter_tool] Download gen_snapshot.zip for macOS desktop (#97627)" (#97664)

This reverts commit 32abf42a.

packages/flutter_tools/lib/src/flutter_cache.dart

@@ -870,13 +870,10 @@ const List<List<String>> _windowsUwpDesktopBinaryDirs = <List<String>>[
 
 const List<List<String>> _macOSDesktopBinaryDirs = <List<String>>[
   <String>['darwin-x64', 'darwin-x64/FlutterMacOS.framework.zip'],
-  <String>['darwin-x64', 'darwin-x64/gen_snapshot.zip'],
   <String>['darwin-x64-profile', 'darwin-x64-profile/FlutterMacOS.framework.zip'],
   <String>['darwin-x64-profile', 'darwin-x64-profile/artifacts.zip'],
-  <String>['darwin-x64-profile', 'darwin-x64-profile/gen_snapshot.zip'],
   <String>['darwin-x64-release', 'darwin-x64-release/FlutterMacOS.framework.zip'],
   <String>['darwin-x64-release', 'darwin-x64-release/artifacts.zip'],
-  <String>['darwin-x64-release', 'darwin-x64-release/gen_snapshot.zip'],
 ];
 
 const List<List<String>> _osxBinaryDirs = <List<String>>[

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

@@ -557,19 +557,6 @@ void main() {
       ]);
   });
 
-  testWithoutContext('macOS desktop artifacts include all gen_snapshot binaries', () {
-    final Cache cache = Cache.test(processManager: FakeProcessManager.any());
-    final MacOSEngineArtifacts artifacts = MacOSEngineArtifacts(cache, platform: FakePlatform());
-    cache.includeAllPlatforms = false;
-    cache.platformOverrideArtifacts = <String>{'macos'};
-
-    expect(artifacts.getBinaryDirs(), containsAll(<List<String>>[
-      <String>['darwin-x64', 'darwin-x64/gen_snapshot.zip'],
-      <String>['darwin-x64-profile', 'darwin-x64-profile/gen_snapshot.zip'],
-      <String>['darwin-x64-release', 'darwin-x64-release/gen_snapshot.zip'],
-    ]));
-  });
-
   testWithoutContext('macOS desktop artifacts ignore filtering when requested', () {
     final Cache cache = Cache.test(processManager: FakeProcessManager.any());
     final MacOSEngineArtifacts artifacts = MacOSEngineArtifacts(cache, platform: FakePlatform());