Add scuba event when calls to RELATES fail in Runway

Summary: Log this to scuba so that we can keep better track of how often failures are occurring. This will be handy for monitoring if issues come up in the future

Reviewed By: aniketmathur, ronmrdechai

Differential Revision: D66721289

fbshipit-source-id: c2eae555d881d9bb7a61e1e67da63c5693a57340

td_util/src/supertd_events.rs

@@ -38,6 +38,7 @@ pub enum Event {
     RE_METADATA_SUCCESS,
     GENERATED_TARGETS_COUNT,
     QE_CHECK,
+    RUNWAY_RELATES_CALL_FAILURE,
 }
 
 #[derive(Debug)]