Option to enable analyzer trailing comma support (#26647).

pkg/analysis_server/lib/src/status/get_handler.dart

Index: pkg/analysis_server/lib/src/status/get_handler.dart
diff --git a/pkg/analysis_server/lib/src/status/get_handler.dart b/pkg/analysis_server/lib/src/status/get_handler.dart
index a49310033489830d1cc569a2dbec99d91fafa7ba..c1c8d6998e0438331027124b0632fefcc531d3ad 100644
--- a/pkg/analysis_server/lib/src/status/get_handler.dart
+++ b/pkg/analysis_server/lib/src/status/get_handler.dart
@@ -1333,6 +1333,7 @@ class GetHandler {
       _writeOption(
           buffer, 'Enable strict call checks', options.enableStrictCallChecks);
       _writeOption(buffer, 'Enable super mixins', options.enableSuperMixins);
+      _writeOption(buffer, 'Enable trailing commas', options.enableTrailingCommas);
       _writeOption(buffer, 'Generate dart2js hints', options.dart2jsHint);
       _writeOption(buffer, 'Generate errors in implicit files',
           options.generateImplicitErrors);