[24-3] Fix double PassAway call in Healthcheck actor (#11104)

Author: UgnineSirdis

ydb/core/viewer/viewer_healthcheck.h

@@ -196,8 +196,7 @@ class TJsonHealthCheck : public TViewerPipeClient {
             return TBase::ReplyAndPassAway(GetHTTPINTERNALERROR("text/plain", "No result"));
         } else {
             if (Format == HealthCheckResponseFormat::PROMETHEUS) {
-                HandlePrometheus();
-                return PassAway();
+                return HandlePrometheus();
             } else {
                 TStringStream json;
                 TProtoToJson::ProtoToJson(json, *Result, JsonSettings);