fix(span-samples-query) Adding trace as column for samples query. (#71043)

Frontend already expects `trace` in the response.

Co-authored-by: Abdullah Khan <abdullahkhan@PG9Y57YDXQ.local>

src/sentry/api/endpoints/organization_events_meta.py

@@ -134,6 +134,7 @@ class OrganizationSpansSamplesEndpoint(OrganizationEventsEndpointBase):
             "timestamp",
             "span_id",
             "profile_id",
+            "trace",
         ]
 
         if lower_bound is None or upper_bound is None: