TF-4136 Fix event reconstruction drops fields from the original event.

core/lib/utils/sentry/sentry_initializer.dart

@@ -73,20 +73,8 @@ class SentryInitializer {
       data: null,
     );
 
-    // Note: The copyWith method is deprecated,
-    // so values must be assigned directly to the instance.
-    return SentryEvent(
-      eventId: event.eventId,
-      contexts: event.contexts,
-      throwable: event.throwable,
-      timestamp: event.timestamp,
-      level: event.level,
-      logger: event.logger,
-      request: sanitizedRequest,
-      tags: event.tags,
-      breadcrumbs: event.breadcrumbs,
-      user: event.user,
-      fingerprint: event.fingerprint,
-    );
+    event.request = sanitizedRequest;
+
+    return event;
   }
 }