fix(webapp): don't override spans from ancestors unless the span is partial (#2532)

Author: ericallam

apps/webapp/app/v3/eventRepository.server.ts

@@ -2001,12 +2001,16 @@ function getAncestorOverrides({
   spansById: Map<string, PreparedEvent>;
   span: PreparedEvent;
 }): AncestorOverrides | undefined {
-  const overrides: AncestorOverrides = {};
-
   if (span.level !== "TRACE") {
     return;
   }
 
+  if (!span.isPartial) {
+    return;
+  }
+
+  const overrides: AncestorOverrides = {};
+
   const cancelledAncestor = findCancelledAncestor(spansById, span, span.spanId);
 
   if (cancelledAncestor) {