Refactor analytics integration and remove clean files

Replaces 'parse_analytics_clean.dart' and 'parse_analytics_endpoints_clean.dart' with unified 'parse_analytics.dart' and 'parse_analytics_endpoints.dart'. Updates exports in 'parse_server_sdk_flutter.dart' and removes legacy analytics files. Streamlines analytics API and endpoint handling for Parse Dashboard integration.

Author: pastordee

packages/flutter/lib/parse_server_sdk_flutter.dart

@@ -23,8 +23,8 @@ export 'package:parse_server_sdk/parse_server_sdk.dart'
     hide Parse, CoreStoreSembastImp;
 
 // Analytics integration
-export 'src/analytics/parse_analytics_clean.dart';
-export 'src/analytics/parse_analytics_endpoints_clean.dart';
+export 'src/analytics/parse_analytics.dart';
+export 'src/analytics/parse_analytics_endpoints.dart';
 
 part 'src/storage/core_store_shared_preferences.dart';